Peptides are short chains of amino acids which are linked together by peptide bonds and have a defined sequence. The function of peptides is primarily to be a signaling molecule in animals or as antibiotics in some lower organisms. Peptides are great polypeptide chains comprising up to 50 amino acids which can be classified by function and also by synthesis. For those of you who want to consume this kind of amino acids, you can get it from some types of foods or supplements such as ghrp 6, for instance.
Some common types of peptides are classified by functions including hormones, neuropeptides, and alkaloids. When classified by synthesis, peptides can ribosomes, nonribosomal, and peptic. The classification system peptide considered an imperfect science as one of the peptides can belong to multiple groups simultaneously and scientists continue to argue as to be classified as a protein peptide, or protein peptides. Many scientists agree that the peptide does not fit easily into a certain pattern, while the protein is more clearly the nature of the adjustment.