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

Ex Output:
Dipeptidyl Peptidase 4

Ex Input:
Cannabinoid discrimination and antagonism by CB(1) neutral and inverse agonist antagonists.

Ex Output:
CB(1)

Ex Input:
Inhibition of the human ether-a-go-go-related gene (HERG) potassium channel by cisapride: affinity for open and inactivated states.

Ex Output:
human ether-a-go-go-related gene (HERG) potassium channel