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]:  By sequencing of exonuclease III deletion clones an open reading frame of 405 nucleotides was found coding for a protein of 135 amino acids with a molecular mass of 15 kDa .
[EX A]: exonuclease III

[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]:  B and C1 fusions with yeast GAL4 DNA - binding and transcriptional activation domains were also found to interact when synthesized and assayed in yeast .
[EX A]:
C1 fusions