rplU 50S ribosomal protein L21 104 RL21_STRR6 This protein binds to 23S rRNA in the presence of protein L20 (By similarity). MSTYAIIKTGGKQVKVEVGQAVYVEKLNVEAGQEVTFNEVVLVGGENTVVGTPLVAGATVVGTVEKQGKQKKVVTYKYKPKKGSHRKQGHRQPYTKVVINAINA spr1012