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 constant expression of large numbers of IL - 2 receptors which may be aberrant may play a role in the uncontrolled growth of adult T - cell leukemia cells .
[EX A]: IL - 2

[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]:  Kappa B - specific DNA binding proteins : role in the regulation of human interleukin - 2 gene expression .
[EX A]:
interleukin - 2