ACT_SITE 47; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"; ACT_SITE 104; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"; ACT_SITE 129; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P15367"