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Figure 4


Fig. 4. Sexual dimorphism in the embryonic gonad. (A,B) Stage 15 embryonic gonad labeled to reveal the germ cells (anti-Vasa, blue), male-specific somatic gonadal precursors (msSGPs) (anti-Sox100b, red) and esgG66B enhancer trap (anti-ß-gal, green). msSGPs are found only in male gonads at this stage, and anterior SGPs have a sex-specific identity as they express esgG66B in males but not females. The esgG66B and mgm1 enhancer traps are expressed differently (in male SGPs and germ cells, respectively), even though both are in the esg locus. Images courtesy of Stephanie Le Bras. (C,D) mgm1 expression (X-gal staining) in stage 16 gonads (outlined). mgm1 expression is specific to germ cells in male embryos (D) and is not expressed in females (C). Images reproduced, with permission, from Wawersik et al. (Wawersik et al., 2005). (E,F) Stage 17 embryonic gonad labeled to reveal the germ cells (anti-Vasa, red) and embryonic hub cells (anti-Fasciclin 3, green). The embryonic hub forms in males, but not in females (E), and anterior germ cells adopt a specific rosette distribution around the embryonic hub (F). Images courtesy of Stephanie Le Bras.





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