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]: Overview of monoclonal antibodies and small molecules targeting the epidermal growth factor receptor pathway in colorectal cancer.
[A]: epidermal growth factor receptor

[Q]: Design, Synthesis, Biological Evaluation, and Docking Studies of (S)-Phenylalanine Derivatives with a 2-Cyanopyrrolidine Moiety as Potent Dipeptidyl Peptidase 4 Inhibitors.
[A]: Dipeptidyl Peptidase 4

[Q]: The effect of a novel transition state inhibitor of methylthioadenosine phosphorylase on pemetrexed activity.
[A]:
methylthioadenosine phosphorylase