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]:  Binding of either factor to the octamer element occurred independently .
[EX A]: octamer element

[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

[EX Q]:  These antibodies also recognized rat liver and murine S49 cell glucocorticoid receptors .
[EX A]:
glucocorticoid receptors