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.

Q:  Engineering temperature - sensitive SH3 domains .

A: SH3 domains
****
Q:  Recombinant propeptides containing mutations of one of the three tryptophan residues were three orders of magnitude less effective as inhibitors of mature cathepsin S than the wild - type propeptide .

A: mature cathepsin S
****
Q:  These data suggest that the secreted , truncated receptor encoded by the 2 . 6 - kb c - erbB transcript can bind to TGF alpha and may play an important growth - regulatory function in vitro .

A:
TGF alpha
****