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.

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

[EX Q]:  In this model , CD8 alpha + Mac - 1 - DCs are supposed to be of lymphoid while CD8 alpha - Mac - 1 + DCs are supposed to be of myeloid origin .
[EX A]: CD8 alpha

[EX Q]:  The ATRA metabolites were found to exert their differentiation effects via the RAR alpha nuclear receptors , because the RAR alpha - specific antagonist BMS614 blocked metabolite - induced CD11c expression in NB4 cells .
[EX A]:
nuclear receptors