Uroplakin III: A uroplakin subtype that heterodimerizes with UROPLAKIN IB to form a component of the asymmetric unit membrane found in urothelial cells.Uroplakin Ib: A tetraspanin domain-containing uroplakin subtype. It heterodimerizes with UROPLAKIN III to form a component of the asymmetric unit membrane found in urothelial cells.Uroplakin II: A uroplakin subtype that heterodimerizes with UROPLAKIN IA to form a component of the asymmetric unit membrane found in urothelial cells.Uroplakin Ia: A tetraspanin domain-containing uroplakin subtype. It heterodimerizes with UROPLAKIN II to form a component of the asymmetric unit membrane found in urothelial cells.Brenner Tumor: A smooth, solid or cystic fibroepithelial (FIBROEPITHELIAL NEOPLASMS) tumor, usually found in the OVARIES but can also be found in the adnexal region and the KIDNEYS. It consists of a fibrous stroma with nests of epithelial cells that sometimes resemble the transitional cells lining the urinary bladder. Brenner tumors generally are benign and asymptomatic. Malignant Brenner tumors have been reported.Urothelium: The epithelial lining of the URINARY TRACT.Tetraspanins: A large superfamily of cell surface membrane proteins characterized by their four transmembrane domains. They play a role in a variety of processes such as cellular adhesion and motility. They may be involved in the organization of cell surface MEMBRANE MICRODOMAINS that regulate the activation of LEUKOCYTES.Membrane Glycoproteins: Glycoproteins found on the membrane or surface of cells.Uroplakins: Specialized membrane glycoproteins that are found on UROTHELIUM cells. They associate into a hexagonal array of 16-nm cell surface particles which form the asymmetric unit membrane of urothelial plaques.