NADH dehydrogenase Fe-S protein 4 18kDa (NADH-coenzyme Q reductase) isoform 2 MAAVSMSVVL RQTLWRRRAV AVAALSVSRV PTRSLRTSTW RLAQDQTQDT QLITVDEKLV YLVPLCFTFC GLATPSLELA TLFPASRHLE FLFTLPGCIL TNPEDFIRSP STYSSNGYHY FNWSSRRAYK N