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]: Metformin increases AMP-activated protein kinase activity in skeletal muscle of subjects with type 2 diabetes.
[EX A]: AMP-activated protein kinase

[EX Q]: Characterization of the molecular mechanisms involved in the increased insulin secretion in rats with acute liver failure.
[EX A]: insulin

[EX Q]: Ligand binding specificities of the eight types and subtypes of the mouse prostanoid receptors expressed in Chinese hamster ovary cells.
[EX A]:
mouse prostanoid receptors