Peptides are tiny messengers that cells use to talk to each other by binding to...

https://brooksiwjk610.wpsuo.com/why-do-different-tissues-respond-differently-to-the-same-peptide

Peptides are tiny messengers that cells use to talk to each other by binding to special sites called receptors. Researchers study peptides to understand how these receptors work and which compounds selectively activate specific signaling pathways