ACT_SITE 57; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P67812"; ACT_SITE 96; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P67812"; ACT_SITE 122; /note="Charge relay system"; /evidence="ECO:0000250|UniProtKB:P67812"