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.

Differential binding mode of diverse cyclooxygenase inhibitors.
cyclooxygenase

A novel membrane sensor for histamine H1-receptor antagonist "fexofenadine".
histamine H1-receptor

Coming full circle: contributions of central and peripheral oxytocin actions to energy balance.

oxytocin

