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]: We now describe a HepG2 cell casein kinase II beta subunit cDNA of 2 . 57 kb containing 96 bases of 5 ' untranslated sequence , 645 bases of open reading frame , and 1832 bases of 3 ' untranslated sequence with two polyadenylation consensus signal sequences and two poly ( A ) stretches .
[A]: casein kinase II

[Q]: Vertebrate U6 small nuclear RNA ( snRNA ) loci exemplify a novel class of polymerase III - transcribed genes that lack an intragenic control region ( ICR ) .
[A]: polymerase III

[Q]: Internalization of prolactin receptor and prolactin in transfected cells does not involve nuclear translocation .
[A]:
prolactin receptor