UP3a is found in the inner membrane of the urinary bladder and contributes to the strength of that membrane and to the membrane's ability to stretch when the bladder is full.[7] It is also found in the renal pelvis, ureter, and prostatic urethra.
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Koga F, Kawakami S, Fujii Y, et al. (2004). "Impaired p63 expression associates with poor prognosis and uroplakin III expression in invasive urothelial carcinoma of the bladder". Clin. Cancer Res. 9 (15): 5501–7. PMID14654529.
Schönfelder EM, Knüppel T, Tasic V, et al. (2006). "Mutations in Uroplakin IIIA are a rare cause of renal hypodysplasia in humans". Am. J. Kidney Dis. 47 (6): 1004–12. doi:10.1053/j.ajkd.2006.02.177. PMID16731295.
Zeng Y, Wu XX, Homma Y, et al. (2007). "Uroplakin III-delta4 messenger RNA as a promising marker to identify nonulcerative interstitial cystitis". J. Urol. 178 (4 Pt 1): 1322–7, discussion 1327. doi:10.1016/j.juro.2007.05.125. PMID17698128.