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Fig. 7. Shh null mutants have reduced HH signaling in the developing
urogenital organs. A reduction in LacZ activity from the del5-LacZ
reporter of Shh-/- mutant PCM and bladder
(B,D) was observed when compared with the control specimen
(A,C). (C,D) Higher magnifications of the boxed areas show the
bladder primordia. b, bladder; c, cloaca; gt, genital tubercle; pcm,
peri-cloacal mesenchyme; u, internal urethra; uc, umbilical cord.