SPMTR.03 MATMI_SCHPM matMi MSAEDLFTIQILCDQIELKLASIVINSNIKLQLKRKKKTQQL 42 Mating-type M-specific polypeptide Mi Mating type proteins are sequence specific DNA-binding proteins that act as master switches in yeast differentiation by controlling gene expression in a cell type-specific fashion. Required for meiosis, but plays no role in conjugation.