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]:  The activation of this signaling pathway requires functional CD4 receptors and is independent of binding to CXCR4 .
[EX A]: CD4 receptors

[EX Q]:  Similar analyses reveal that PI 3 - kinase is also critical in triggering NF - kappaB DNA - binding activity and IkappaBalpha degradation following LPS stimulation .
[EX A]: NF - kappaB

[EX Q]:  Peritoneal macrophages seem to participate in the process of peritoneal fibrosis and monocyte chemoattractant protein - 1 ( MCP - 1 ) plays a key role in the recruitment of monocytes toward the peritoneal cavity .
[EX A]:
MCP - 1