Uroplakin-3b (Upk3b)

Component of the asymmetric unit membrane (AUM); a highly specialized biomembrane elaborated by terminally differentiated urothelial cells. May play an important role in AUM-cytoskeleton interaction in terminally differentiated urothelial cells.

It also contributes to the formation of urothelial glycocalyx which may play an important role in preventing bacterial adherence (By similarity). .