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.

 Members of the steroid / hormone nuclear receptor superfamily regulate target gene transcription via recognition and association with specific cis - acting sequences of DNA , called hormone response elements ( HREs ) .
nuclear receptor superfamily

 We conclude from these observations that the cTnC 3 ' Ile element is a composite enhancer that functions through the combined interactions of at least five regulatory elements and their cognate binding factors : three or four E - boxes , a MEF - 2 site , and a MEF - 3 site .
MEF - 2

 In contrast , vRel lacks a strong C - terminal gene activation function , since a LexA fusion protein containing C - terminal vRel sequences alone only weakly activated transcription .

LexA fusion protein