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MEN1, also named as Menin or MEAI, is a tumor suppressor protein encoded by the MEN1 gene. Its inactivation has been implicated in tumors of many endocrine tissues. Germline inactivating mutations of MEN1 gene are the main cause of multiple endocrine neoplasia type 1 (MEN1), a syndrome characterized by tumors in the pituitary gland, the parathyroid glands, and the enteropancreatic neuroendocrine tissues.