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]:  In contrast , 50 % downmodulation of HLA - A2 by Nef required 16 to 24 h and about 50 - to 100 - fold - greater concentrations of 4 - HT .
[EX A]: HLA - A2

[EX Q]:  These data further suggest that Bright may contribute to increased gene expression by remodeling the immunoglobulin locus during B cell development .
[EX A]: immunoglobulin locus

[EX Q]:  Recently , NF - kappaB induction has been shown to play a role in protecting cells from programmed cell death .
[EX A]:
NF - kappaB