Q: 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.
The absence of P - CREB following CD3 cross - linking was unexpected , as other laboratories reported increased phosphorylation of CREB following CD3 cross - linking of the Jurkat lymphocyte cell line .
A:
P - CREB