Peptides are tiny messenger molecules that cells use to communicate by binding...

https://zanessplendidcolumns.opalvector.com/posts/how-do-i-cite-peptide-research-without-overstating-it

Peptides are tiny messenger molecules that cells use to communicate by binding to specific receptors. Researchers study these interactions to understand how signaling pathways work and how selective the peptides are for different receptors