May be involved in the regulation of photosystem II (By similarity). MASTQCFLHHHALSTPARTSLVRGIVPSLKSNQLLVCRAQNKQSAPQQDNVNSVSVSRRLALTLLIGAAAVGSKVSPADAAYGEAANVFGKPKTDTDFQTYNGDGFKLQIPSKWNPNKEVEYPGQVLRFEDNFDATSNVIVAITPTDKKSITDFGSPEQFLSQVDYLLGRQAYSGKTDSEGGFESDAVAIANVLETSTAEVGGKQYYYLSILTRTADGNEGGKHQLVTATVNDGKLYICKAQAGDKRWFKGAKKFVENTATSFSLA PSBP3 PSBP3_TOBAC 266 OEC 23 kDa subunit 23 kDa thylakoid membrane protein 23 kDa subunit of oxygen evolving system of photosystem II Oxygen-evolving enhancer protein 2-3, chloroplastic OEE2-AF