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BRCA1-associated protein 1 (BAP1) is a ubiquitin hydrolase that acts as a BRCA1 growth control pathway tumor suppressor. Specifically, BAP-1 localizes to the nucleus where it interferes with the BRCA1/BARD1 heterodimer activity and mediates deubiquitination of histone H2A and HCFC1. BAP 1 is highly expressed in testis, placenta, breast and ovary.