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.

[EX Q]:  Nuclear transcription assays confirmed that cys - 3 + was under sulfur - regulated transcriptional control and that cys - 3 + transcription was constitutive in sulfur controller ( scon ) - negative regulator mutants .
[EX A]: sulfur controller

[EX Q]:  Mapping of the region in KAP - 1 required for HP1 interaction showed that amino acid substitutions which abolish HP1 binding in vitro reduce KAP - 1 mediated repression in vivo .
[EX A]: KAP - 1

[EX Q]:  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 .
[EX A]:
CAT gene