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.

Q:  To study B cell - specific changes that occur during the aging process , we investigated expression patterns of Pax - 5a and 5d in mature B cells of young and aged mice .

A: Pax - 5a
****
Q:  Among six or so PKC isoforms expressed in T cells , only PKCtheta participates in the assembly of the supramolecular activation clusters at the contact site of the TCR with Ag .

A: PKC isoforms
****
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 .

A:
signaling molecules
****