PNAS is the world's most-cited multidisciplinary scientific serial. It publishes high-impact research reports, commentaries, perspectives, reviews, colloquium papers, and actions of the Academy. In ...
Proceedings of the National Academy of Sciences of the United States of America, Vol. 105, No. 5 (Feb. 5, 2008), pp. 1626-1631 (6 pages) We report the identification and functional analysis of nine ...