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]:  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 data suggest that ubiquitous expression of the tolerizing Ad5 E1A peptide within a short period of time causes activation - induced cell death of Ad5 E1A - specific CTLs .
[EX A]: Ad5 E1A

[EX Q]:  The ZEBRA protein activates expression of Epstein - Barr virus early - lytic - cycle genes in human B lymphocytes .
[EX A]:
ZEBRA protein