>9WCV_1|Chains A, B, C, D|Nitrogen-fixing NifU domain protein|Methanothrix thermoacetophila (strain DSM 6194 / JCM 14653 / NBRC 101360 / PT) (349307) MIQQTGYSKKVMEHFMNPRNVGVIDDPDGYGKVGNPVCGALMEIFIKVGDEKIEDIKFRTFGCGAAIATSSMITEMARGKSLEEAMRITRNDVADALDGLPPQKMHCSNLAADALHAAINDYLSKKQKHLEHHHHHH