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]: A review of the structural and functional features of olmesartan medoxomil, an angiotensin receptor blocker.
[EX A]: angiotensin receptor

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

[EX Q]: Cloning, Characterization, and Sulfonamide and Thiol Inhibition Studies of an α-Carbonic Anhydrase from Trypanosoma cruzi, the Causative Agent of Chagas Disease.
[EX A]:
α-Carbonic Anhydrase