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Messengers are important molecules in the body that relay signals from one cell to another. They allow cells to communicate with each other and coordinate their activities. There are many different types of messengers, including hormones, neurotransmitters, and cytokines.
Hormones are messengers that are produced by the endocrine glands. They regulate many functions in the body, such as growth, metabolism, and reproduction. Neurotransmitters are messengers that transmit signals between nerve cells. They play an important role in brain function and mental health. Cytokines are messengers that help to regulate the immune system.