instruction:
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.
question:
 We identified two potential phosphorylation sites at serine49 and serine133 , both of which seem to be necessary for Myf - 5 activity .
answer:
Myf - 5


question:
 We have utilized transient transfections , mutation analysis , electromobility gel - shifts , and immunoblot analysis to test the hypothesis that expression of the CTalpha gene is controlled in part by the binding of three trans - acting nuclear factors , Sp1 , Sp2 , and Sp3 .
answer:
CTalpha gene


question:
 However , at the time of salvage treatment , the mean serum PSA levels were 9 . 1 and 1 . 1 ng / mL for the salvage RP and salvage RT groups , respectively ( P = 0 . 0001 ) .
answer:

serum PSA