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]:  Tk mRNA is induced following treatment with estrogen .
[EX A]: Tk mRNA

[EX Q]:  In addition , caspase - 3 , an executioner of apoptosis , was activated and its substrate , poly ( ADP - ribose ) polymerase ( PARP ) , was cleaved during 2 , 2 ' , 4 , 6 , 6 ' - PeCB - induced apoptosis .
[EX A]: caspase - 3

[EX Q]:  The discordant mutants may reflect interactions with a variable domain of a conserved component or unique interactions with specialized components of the basal transcription apparatus in different cells .
[EX A]:
variable domain