Peptides are tiny proteins that work like messengers, carrying signals between...

https://dominicksultimatejournals.readspirex.com/posts/why-are-so-many-hormones-peptides-exploring-the-language-of-cellular-communication

Peptides are tiny proteins that work like messengers, carrying signals between cells by binding to specific receptors. Researchers use peptides to explore how these receptors respond and how signals get passed along inside cells