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:  Here , we investigated how CD28 costimulation functions to allow TCR - triggered resting T cells to acquire IL - 12 responsiveness .

SOLUTION: IL - 12

PROBLEM:  However , most effector CD8 + T cells recovered after exposure to Ag do not produce sufficient IL - 2 to sustain growth , and depend on CD4 + T helper cells for this obligate growth factor .

SOLUTION: IL - 2

PROBLEM:  Thus , unlike Old World primates , cortisol in New World primates has only weak sodium - retaining potency because the aldosterone receptor has a low affinity for cortisol .

SOLUTION:
aldosterone receptor