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:
 Its activity was twice that of a construct where the CAT gene was driven by the H - 2Kb 5 ' enhancer region ( H2TF1 / KBF1 site ) and comparable to that of pRSVCAT construct carrying the strong Rous sarcoma virus LTR enhancer .
answer:
CAT gene


question:
 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 .
answer:
mature cathepsin S


question:
 Such tetranucleotides are common in promoter regions , particularly in activating transcription factor / cyclic AMP response element - binding protein ( ATF / CREB ) and E - box motifs , suggesting that PIF may modulate the transcription of many genes .
answer:

activating transcription factor