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:  Terminally differentiated skin mast cells also failed to up - modulate their ICAM - 3 , suggesting the requirement for some degree of immaturity for the process .

SOLUTION: ICAM - 3

PROBLEM:  Accelerated spontaneous thymocyte death in the absence of TCF - 1 correlates with aberrantly low expression of the anti - apoptotic protein Bcl - x ( L ) .

SOLUTION: TCF - 1

PROBLEM:  However , the recent description of estrogen receptors in the thymus and in some lymphocyte subpopulations , as well as a deeper understanding of regulating factors in the immune system , open the possibility of a more detailed understanding of the estrogen mechanism of interference .

SOLUTION:
estrogen receptors