Visceral analysis in wild type and mutants.

<p>(A–B) Autopsy preparations of abdominal viscera in newborns. Superficial (left panel), profound (medium panel) and corresponding scheme (right panel) are shown. Mutant embryos exhibit relatively normal stomach and midgut but hypoplastic kidneys and hindgut and absence of bladder. (C–D) H&E-stained mid sagittal sections of wild-type (C) and <i>Bmp7^−/−;Shh^+/−</i> mutants (D) at the embryonic stage indicated at the top. The yellow arrows indicate the hindgut and the blue arrows the urethra. Note the absence of urogenital duct and septum in mutants. Abbreviations: b: bladder; g: gonad and gonadal duct; hg: hindgut; k: kidney; u: urachus. The urogenital septum is indicated by an asterisk.