As are important chemical messengers such as enzymes, neurotransmitters and hormones. (truthaboutprotein.com)
Hormones are vital important chemical messengers that affect our overall health. (hghenergizerplus.com)
They stimulated a cluster of key brain cells, boosted the production of a protein linked to sleep or gave the flies a drug that mimicked the activity of an important chemical messenger. (sciencedaily.com)