Reader Comments (2)
Post a new comment on this article
-
1 Response27 May 2011
18:58 GMT
Most RecentComment from the PLoS ONE Group Posted by PLOS_ONE_Group on 26 Apr 2011 at 10:36 GMT
Click through the PLOS taxonomy to find articles in your field.
For more information about PLOS Subject Areas, click here.
Loading metrics
Open Access
Peer-reviewed
Research Article
Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Howard Hughes Medical Institute, Science Education Alliance, Chevy Chase, Maryland United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Current address: Howard Hughes Medical Institute, Chevy Chase, Maryland, United States of America
Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Howard Hughes Medical Institute, Science Education Alliance, Chevy Chase, Maryland United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biological Sciences, University of Maryland, Baltimore, Maryland, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biological Sciences, University of Maryland, Baltimore, Maryland, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Howard Hughes Medical Institute, Science Education Alliance, Chevy Chase, Maryland United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, University of Maryland, Baltimore, Maryland, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, University of Maryland, Baltimore, Maryland, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Zoology, Oregon State University, Corvallis, Oregon, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Department of Biology, James Madison University, Harrisonburg, Virginia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Department of Biology, University of Louisiana at Monroe, Monroe, Louisiana, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biological Sciences, University of Mary Washington, Fredericksburg, Virginia, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Biology Department, College of William & Mary, Williamsburg, Virginia, United States of America
⨯Affiliation Biology Department, A. Paul Schaap Science Center, Hope College, Holland, Michigan, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America
⨯Affiliation Biological Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
⨯Affiliation Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
⨯Affiliation Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
⨯Affiliation Department of Biology, Spelman College, Atlanta, Georgia, United States of America
⨯Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯* E-mail: gfh@pitt.edu
Affiliation Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
⨯Post a new comment on this article