name: apical plasma membrane urothelial plaque
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def: "A scallop-shaped plaque, also referred to as an asymmetric unit membrane (AUM), found in the apical plasma membrane of urothelial superficial (umbrella) cells which form a a barrier to the passage of water and soluble toxic compounds found in urine. The plaques are thickened regions of membrane composed of uroplakin transmembrane proteins which form a crystalline array." [GOC:krc, PMID:21468280, PMID:21887288]
synonym: "asymmetric unit membrane" EXACT 
synonym: "AUM" RELATED 
is_a: GO:0005887 ! integral component of plasma membrane
relationship: part_of: GO:0016324 ! apical plasma membrane
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