>5n9j_D mol:protein length:138 Mediator of RNA polymerase II transcription subunit 21MACRCTQLQDTIDEVATQFYSSIHYLSSHHDFVPLPGQEKVSDSKVNPISAEELQFAQRDLAKDLVTKFMQIDTLINQLPGISTAPKHQLEKIKKLQNSIEEKQLERKSLESENEDLKLQLAKRIETFGRLSCVLFQP