Protein BEX1 also known as brain-expressed X-linked protein 1 is a protein that in humans is encoded by the BEX1 gene. BEX1 is a part of the BEX gene family well conserved in mammals. It is expressed in a wide range of tissues. BEX proteins have connections to cancer and their direct functions are not fully understood. BEX1 is suggested to act as a tumor suppressant in certain situations.

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