# OC Root 2nd 3rd 4th PC Gene/Definition OC.187425 Archaea.177 Euryarchaeota.10159 Methanocaldococcus.2520 mja.1234 mja:MJ_1218 type I restriction-modification enzyme 1, S subunit; K01154 type I restriction enzyme, S subunit [EC:3.1.21.3]