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]:  This enhancer element functioned in a position - and orientation - independent manner both on the Pax - QNR P0 promoter and the heterologous thymidine kinase promoter .
[A]: thymidine kinase


[Q]:  Since RIP140 generally down - regulates receptor activity in mammalian cells and specifically down - regulates coactivation mediated by SRC - 1 , we propose a model in which RIP140 indirectly regulates nuclear receptor AF - 2 activity by competition for coactivators such as SRC - 1 .
[A]: SRC - 1


[Q]:  Sgs - 4 is one of the eight known genes coding for larval secretion proteins in Drosophila melanogaster .
[A]:
Sgs - 4