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:  Activated PBMCs also expressed lower levels of RXRalpha protein , and a DNA binding assay showed that the activation - induced loss of RXRalpha mRNA and protein expression correlated with the loss of DNA binding activity of this protein .

SOLUTION: RXRalpha mRNA

PROBLEM:  BCL - 6 is essential for germinal center formation and thus for affinity maturation of immunoglobulin ( Ig ) genes by somatic mutations .

SOLUTION: BCL - 6

PROBLEM:  At 37 degrees C the predominant form of the hormone - receptor complex was nuclear .

SOLUTION:
receptor complex