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:
Synthesis of quinoline derivatives: discovery of a potent and selective phosphodiesterase 5 inhibitor for the treatment of Alzheimer's disease.

Ex Output:
phosphodiesterase 5


Ex Input:
Thalidomide prevents alcoholic liver injury in rats through suppression of Kupffer cell sensitization and TNF-alpha production.

Ex Output:
TNF-alpha


Ex Input:
Comparative effects of three different potent renin inhibitors in primates.

Ex Output:

renin


