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.

[Q]:  Pax - 6 constructs lacking the C - terminal activation domain repressed betaB1 - crystallin promoter activity as effectively as the full - length protein , but the PD alone or Pax - 6 ( 5a ) , a splice variant with an altered PD affecting its DNA binding specificity , did not .
[A]: Pax - 6


[Q]:  The present report shows that a cis - acting element between - 189 and - 175 bp , which binds thyroid transcription factor - 1 ( TTF - 1 ) , is involved in both activities .
[A]: TTF - 1


[Q]:  p107 induction of E2F DNA binding was observed primarily in S phase cells coincident with the increase in p107 protein levels .
[A]:
p107 protein