Final answer:
Peptides are important messengers for the central nervous system and have dual roles as neurotransmitters and hormones.
Explanation:
Peptides are messengers for the central nervous system. They are a type of intercellular signal that can span a wide range of molecule types, playing a crucial role in cellular communication. Peptides serve as neurotransmitters in the brain and also function as hormones, showcasing their versatility in different biological processes.
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