>sp|A9BCE2|ATPF2_PROM4 ATP synthase subunit b' OS=Prochlorococcus marinus GN=atpF2 MTSLLLFGASEGGLFDFDATLPLMAVQVVLLTFILNALFFKPVGRVVEEREDYVTSSLAD AKKKLAEVEKLESDLKNQLKEARLAAQSVINEAETDSENLYREALALATAEANASREEAR REIDSQRESALNQLRSDAEKLGDLIVERLLASK