Alternative mutations of a positively selected residue elicit gain or loss of functionalities in enzyme evolution.
Proc Natl Acad Sci U S A. 2006 Mar 28;103(13):4876-81. doi: 10.1073/pnas.0600849103. Epub 2006 Mar 20.
Proc Natl Acad Sci U S A. 2006.
PMID: 16549767
Free PMC article.