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Adjacent cross sections (A-H) and sagittal sections (I-L) from the Six1Cre-hpAP and Rosa26-lacZ reporter (R26RZ/+) double heterozygous embryos at both e13.5 and e15.5 were stained for hpAP and β-galactosidase (β-gal) activities. B, bladder; dUE, distal urethral epithelia; P, perineum; PF, preputial fold; PG, preputial gland; U: urethral. See Figure 1 legend for more abbreviations.
