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.

Q:  The glucocorticoid target tissues that have been examined ( circulating mononuclear lymphocytes and cultured skin fibroblasts ) have normal concentrations of glucocorticoid receptors with decreased affinity for dexamethasone .

A: glucocorticoid receptors
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Q:  Activated STAT3 was shown to bind an SIE - related element in the murine mcl - 1 promoter .

A: Activated STAT3
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Q:  Introduction of Tax into resting Kit 225 cells induced activation of the G1 / S transition regulation cascade consisting of activation of cyclin dependent kinase 2 ( CDK2 ) and CDK4 , phosphorylation of the Rb family proteins and an increase in free E2F .

A:
Rb family proteins
****