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.

CD45 tyrosine phosphatase controls common gamma - chain cytokine - mediated STAT and extracellular signal - related kinase phosphorylation in activated human lymphoblasts : inhibition of proliferation without induction of apoptosis .
CD45 tyrosine phosphatase