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.

 BACKGROUND : Antigen - receptor interactions on lymphocytes result in local clustering of actin , receptors and signaling molecules into an asymmetric membrane structure termed a cap .
signaling molecules

 Ultrastructural studies demonstrated sequential changes in the cytoplasm , including swelling of mitochondria and cytoplasmic decompartmentalizati , followed by loss of surface microvilli with the appearance of ` ` holes ' ' in the cell membrane , and subsequent condensation of nuclear chromatin .
nuclear chromatin

 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 .

Bcl - 3