Authors: Lynn E Macdonald; Katherine E Wortley; Lori C Gowen; Keith D Anderson; Jane D Murray; William T Poueymirou; Mary V Simmons; Dianna Barber; David M Valenzuela; Aris N Economides; Stanley J Wiegand; George D Yancopoulos; Mark W Sleeman; Andrew J Murphy Journal: Proc Natl Acad Sci U S A Date: 2005-02-07 Impact factor: 11.205