Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 We also found that Z itself is SUMO - 1 modified ( through amino acid 12 ) and that Z competes with PML for limiting amounts of SUMO - 1 .

SUMO - 1