Peptides are tiny chains of amino acids that act as messengers, sending signals...

https://www.bookmark-belt.win/peptides-are-tiny-messenger-molecules-that-help-cells-communicate-by-binding-to-1

Peptides are tiny chains of amino acids that act as messengers, sending signals between cells by binding to specific receptors. Researchers study how peptides interact with these receptors to understand selectivity and trigger different signaling pathways