Peptides are short chains of amino acids linked by peptide bonds. Typically, peptides contain less than 50 amino acids. Anything longer would be considered a protein. Peptides serve many important biological functions. For example:
- Neuropeptides act as neurotransmitters and signaling molecules in the nervous system
- Antimicrobial peptides provide defense against pathogens
- Oxytocin and vasopressin are peptide hormones that influence social behaviors
- Insulin is a peptide hormone that regulates blood glucose levels