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]: Central effects of fexofenadine and cetirizine: measurement of psychomotor performance, subjective sleepiness, and brain histamine H1-receptor occupancy using 11C-doxepin positron emission tomography.
[EX A]: histamine H1-receptor

[EX Q]: Benzenesulfonamides: a unique class of chemokine receptor type 4 inhibitors.
[EX A]: chemokine receptor type 4

[EX Q]: Pharmacological evidence of functional inhibitory metabotrophic glutamate receptors on mouse arousal-related cholinergic laterodorsal tegmental neurons.
[EX A]:
metabotrophic glutamate receptors