TASK DEFINITION: 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.
PROBLEM:  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 ) .

SOLUTION: nuclear receptor superfamily

PROBLEM:  Although several other signal transduction molecules also contain tandemly occurring SH3 and SH2 domains , the function of these closely spaced domains is not well understood .

SOLUTION: SH2 domains

PROBLEM:  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 .

SOLUTION:
KAP - 1