TASK DEFINITION: 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.
PROBLEM: Nobiletin attenuates metastasis via both ERK and PI3K/Akt pathways in HGF-treated liver cancer HepG2 cells.

SOLUTION: ERK

PROBLEM: The catalytic competence of cytochrome P450 in the synthesis of serotonin from 5-methoxytryptamine in the brain: an in vitro study.

SOLUTION: cytochrome P450

PROBLEM: Muscarinic cholinergic and histamine H1 receptor binding of phenothiazine drug metabolites.

SOLUTION:
histamine H1 receptor