Nat. Biotechnol. 23, 1325 (2005) In the print version of this article and the version originally published online, a name was misspelled. On page 1325, paragraph 3, line 4; paragraph 4, line 1, 12; and paragraph 9, line 1, the surname of Kenneth Kaitin, director of the Tufts Center for the Study of Drug Development in Boston, has been misspelled.