| Type | MGI:General | Description | at E18.5, an abnormal bladder epithelium is observed along the dorso-ventral axis, with the dorsal epithelium consisting mainly of simple cuboidal cells and the ventral epithelium consisting primarily of simple squamous cells the ventral urothelium is neither committed to stratification nor differentiated, whereas the dorsal urothelium is both committed and differentiated at E11.5, a reduction in cell proliferation is observed in the ventral bladder epithelium and in adjacent mesenchyme relative to wild-type controls, as shown by BrdU staining at E12.5, an increase in ventral bladder epithelial apoptosis is associated with a transient upregulation of p53 and p73 expression at E12.5 and E13.5, developing bladders exhibit increased mitochondrial apoptotic activity relative to wild-type controls |