?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Le%2C+Si+Quang&rft.aulast=Le&rft.aufirst=Si+Quang&rft.issue=10&rft.volume=29&rft.date=1+October+2012&rft.issn=1537-1719&rft.atitle=Modeling+Protein+Evolution+with+Several+Amino+Acid+Replacement+Matrices+Depending+on+Site+Rates&rft.title=Molecular+Biology+and+Evolution&rft.pages=2921-2936&rft.genre=article