Peptides are tiny protein messengers that cells use to communicate and control...

https://www.bookmarkmaster.win/peptides-are-tiny-messengers-that-cells-use-to-send-signals-by-binding-to

Peptides are tiny protein messengers that cells use to communicate and control functions. Researchers study peptides to see how they bind to receptors and trigger signals inside cells, like changes in intracellular calcium levels