?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Seymour%2C+RM&rft.aufirst=RM&rft.aulast=Seymour&rft.issn=1553-734X&rft.title=PLoS+Computational+Biology&rft.issue=12&rft.atitle=Density+dependence+triggers+runaway+selection+of+reduced+senescence.&rft.volume=3&rft.date=28+December+2007&rft.genre=article