Authors: Marco Seandel; Daylon James; Sergey V Shmelkov; Ilaria Falciatori; Jiyeon Kim; Sai Chavala; Douglas S Scherr; Fan Zhang; Richard Torres; Nicholas W Gale; George D Yancopoulos; Andrew Murphy; David M Valenzuela; Robin M Hobbs; Pier Paolo Pandolfi; Shahin Rafii Journal: Nature Date: 2007-09-20 Impact factor: 49.962