Authors: Wayne W Hancock; Frank M Szaba; Kiera N Berggren; Michelle A Parent; Isis K Mullarky; John Pearl; Andrea M Cooper; Kenneth H Ely; David L Woodland; In-Jeong Kim; Marcia A Blackman; Lawrence L Johnson; Stephen T Smiley Journal: Proc Natl Acad Sci U S A Date: 2004-02-19 Impact factor: 11.205