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]:  One of the challenges in defining the molecular events regulated by Nef has been obtaining good expression of Nef protein in T cells .
[EX A]: Nef protein

[EX Q]:  Glucocorticoid receptors in cytosol and nuclear extract of human leukocytes .
[EX A]: Glucocorticoid receptors

[EX Q]:  An assay for the quantitation of cytoplasmic and nuclear glucocorticoid receptors in lymphoid tissue has been developed using controlled pore glass ( CPG ) beads .
[EX A]:
glucocorticoid receptors