Menin is a nuclear scaffold protein involved in many biological processes (including the regulation of hematopoiesis and myeloid proliferation) and is encoded by the MEN1 gene (containing 10 exons and located on chromosome 11q13), which is mutated in patients with multiple endocrine neoplasia type 1 (MEN1). Here, MEN1 is linked to multiple endocrine neoplasia type 1.