TASK DEFINITION: In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.
PROBLEM: The effect of a peripheral block on inflammation-induced prostaglandin E2 and cyclooxygenase expression in rats.

SOLUTION: prostaglandin E2

PROBLEM: Ligand binding specificities of the eight types and subtypes of the mouse prostanoid receptors expressed in Chinese hamster ovary cells.

SOLUTION: prostanoid

PROBLEM: The effect of a peripheral block on inflammation-induced prostaglandin E2 and cyclooxygenase expression in rats.

SOLUTION:
prostaglandin E2