MEN1, the gene responsible for multiple endocrine neoplasia type 1, is a tumour suppressor gene that encodes a protein called Menin which may be an atypical GTPase stimulated by nm23[1].

1: Menin, the Multiple Endocrine Neoplasia Type 1 Gene Product, Exhibits GTP-hydrolyzing Activity in the Presence of the Tumor Metastasis Suppressor nm23. Yaguchi H, Ohkura N, Tsukada T, Yamaguchi K; J Biol Chem 2002;277:38197-38204. PMID:12145286