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:  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 .

A: variable domain
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Q:  These later findings indicate that neither homo - nor heterodimer formation is an absolute prerequisite for I kappa B alpha recognition of p65 .

A: I kappa B
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Q:  Taken together with prior in vivo transcription studies , these results suggest that the biological activities of p65 and p50 homodimers are independently regulated , thereby providing an integrated and flexible control mechanism for the rapid activation and repression of NF - kappa B / Rel - directed gene expression .

A:
p50 homodimers
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