ACT_SITE 151; /note="Charge relay system"; /evidence="ECO:0000256|PIRSR:PIRSR615500-1, ECO:0000256|PROSITE-ProRule:PRU01240"; ACT_SITE 221; /note="Charge relay system"; /evidence="ECO:0000256|PIRSR:PIRSR615500-1, ECO:0000256|PROSITE-ProRule:PRU01240"; ACT_SITE 559; /note="Charge relay system"; /evidence="ECO:0000256|PIRSR:PIRSR615500-1, ECO:0000256|PROSITE-ProRule:PRU01240"