Peptides are tiny messengers that cells use to send signals by binding to...

https://rafaelsuniqueop-eds.evergrovio.com/posts/why-can-t-scientists-test-every-peptide-idea-in-humans-first

Peptides are tiny messengers that cells use to send signals by binding to specific receptors on their surface. Researchers study peptides to understand how these receptors work and how selective they are for different signals