Figure 2B. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.mod.2004.01.006] Mech Dev 121: 237-46, Mitsunaga K; Araki K; Mizusaki H; Morohashi K; Haruna K; Nakagata N; Giguere V; Yamamura K; Abe K, Loss of PGC-specific expression of the orphan nuclear receptor ERR-beta results in reduction of germ cell number in mouse embryos. Copyright 2004.