Fig. 1. Fgfr2-IIIb is expressed in urethral plate epithelium and prepuce of the mouse genital tubercle. Using whole-mount in situ hybridization, Fgfr2-IIIb transcripts were localized in external genitalia of wild-type mouse embryos at E10.5 (A), E11.5 (B), E12.5 (C), E13.5 (D), E14.5 (E), E15.5 (F) and E16.5 (G). Arrows indicate the position of the urethral plate epithelium and arrowheads indicate the preputial swellings. Ventral view of the embryo is shown in A, and ventral views of the genital tubercle are shown in B-G. Negative control using sense probe is shown in inset of C.