Fig 4A. [doi:10.1073/pnas.0611510104] Copyright: This image is from Dominguez MG; Hughes VC; Pan L; Simmons M; Daly C; Anderson K; Noguera-Troise I; Murphy AJ; Valenzuela DM; Davis S; Thurston G; Yancopoulos GD; Gale NW, Proc Natl Acad Sci U S A 2007 Feb 27;104(9):3243-8. [PMID:17360632] Copyright 2007 National Academy of Sciences, U.S.A.