Peptide vs protein: A peptide is make of a few amino aicd building blocks but a protein is made of hundreds to thousands of amini acids. When a protein is degraded , it breaks up into smaller peptides. Dopamine is not a peptide since it is a modified single amino acid. Hormones from the brain are peptides but some such as acth come from a larger precurose protein. Great questions.
Answered 6/25/2014
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