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:  Bcl - 3 protein was also highly expressed in early burst - forming unit - erythroid ( BFU - E ) - derived erythroid precursors ( day 7 ) and decreased during maturation ( days 10 and 14 ) , suggesting that Bcl - 3 is involved in normal erythroid proliferation .

SOLUTION: Bcl - 3

PROBLEM:  MHC tetramers , which constitute a labeled MHC - peptide ligand suitable for binding to the Ag - specific receptor on T cells , provide a novel approach for the detection and characterization of such rare cells .

SOLUTION: MHC tetramers

PROBLEM:  When these cell lines are fused , class II genes are reexpressed , indicating that immunodeficiencies in bare lymphocyte syndrome patients are the result of two distinct mutations .

SOLUTION:
class II genes