Fig3G. from [doi:10.1098/rstb.2003.1324] Philos Trans R Soc Lond B Biol Sci 2003 358(1436): 1363-70, Saitou M; Payer B; Lange UC; Erhardt S; Barton SC; Surani MA, Specification of germ cell fate in mice. Copyright 2003 [PMID:14511483]