254 The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. Photosynthetic reaction center H subunit Reaction center protein H chain RCEH_RHOCA MVGVNFFGDFDLASLAIWSFWAFLAYLIYYLQTENMREGYPLENDDGKLSPNQGPFPVPSPKTFDLADGRKIVVPSVENEEAHRRTDLALERTSVNEGYPFRPTGNPMLDGVGPASWVPRRDEPEVDAHGHNKIQPMRKTEMKVSAGRDPRGMPVQAGDTEVVGKIVDMWVDIPEQLVRYLEVELNSGKKKLLPMTMLKIWSDRVRVNAITSDLFDTIPDIKSPDVVTKLEEDKISAYVAGGYMYAKGVKPYAL puhA