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]:  Although DRA1 * 0101 / DRB1 * 0401 and DRA1 * 0101 / DRB1 * 0404 are structurally very similar , nonoverlapping VP16 epitopes were identified , illustrating high selectivity of individual allele polymorphisms within common MHC variants .
[EX A]: VP16 epitopes

[EX Q]:  Bone resorption is regulated by the immune system , where T - cell expression of RANKL ( receptor activator of nuclear factor ( NF ) - kappaB ligand ) , a member of the tumour - necrosis factor family that is essential for osteoclastogenesis , may contribute to pathological conditions , such as autoimmune arthritis .
[EX A]: nuclear factor

[EX Q]:  Three new epitopes were identified in VP16 , a tegument protein associated with VP22 .
[EX A]:
tegument protein