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:  Receptor cleavage by these and other endogenous enzymes may account for previous observations of ` ` abnormal ' ' receptors in cytosols from some leukemic specimens .

SOLUTION: endogenous enzymes

PROBLEM:  Phosphorylation , in turn , targets BCL - 6 for rapid degradation by the ubiquitin / proteasome pathway .

SOLUTION: BCL - 6

PROBLEM:  In contrast , the binding of [ 3H ] DEX to C7 cytosol revealed a single class of binding sites ( Kd = 1 . 9 nM ; receptor concentration , 0 . 46 pmol / mg protein ) .

SOLUTION:
binding sites