Fig. 1.

Identification of genes expressed in a sex-specific manner in embryonic Drosophila gonads. (A) Stage 17 embryos labeled by in situ hybridization with probes for genes as indicated. Anterior is to the left. Embryos have also been hybridized with a probe for a Dfd-lacZ transgene (two dots in anterior) carried on the paternal X chromosome, which identifies XX embryos. (B) Graph indicating the percentage of XY or XX embryos with CG9253 expression in the gonads at stages 13, 15 and 17. In situ hybridization signals of varying intensity are shown; solid bars indicate strong signal, shaded bars, medium signal and hatched bars, weak signal.