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:  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:  As anticipated , NRXI could be demonstrated in all lymphoid cells studied from obligate carriers of XSCID and an obligate carrier of XLH but not on a carrier of X - linked immunodeficiency with hyper - IgM .

SOLUTION: hyper - IgM

PROBLEM:  A complete inhibition of DNA synthesis by dexamethasone ( Dx ) could be observed when IL 2 - depleted cultures of CTL were either incubated for 6 h with the hormone prior to the addition of IL 2 or treated simultaneously with Dx and a low concentration of IL 2 .

SOLUTION:
IL 2