TASK DEFINITION: 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.
PROBLEM:  Under the same conditions , Lck did not stimulate IL - 2 promoter unless it was activated by mutation .

SOLUTION: IL - 2

PROBLEM:  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 .

SOLUTION: nuclear factor

PROBLEM:  Our results suggest that the eventual appearance of CD80 on recently activated CD86 + APC is important for the superinduction of IL - 2 production and to support vigorous T cell proliferation .

SOLUTION:
IL - 2