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https://www.chancebio.com/products/peptide/
Peptide is a small molecular structure of protein, peptide is the condensation of one amino acid and another amino acid to form titanium. Amino acids are called peptide bonds in the chemistry of proteins, the molecules of amino acids are small and the molecules of proteins are large, two and more amino acids dehydrate and condense to form peptides, one peptide and the other peptides carry out the overlap of multiple groups to form protein molecules. Protein is sometimes called polypeptide, as the name suggests, polypeptide is actually several proteins, several amino acids connected to form a functional structure, it can be divided into antihypertensive peptide, antioxidant peptide, cholesterol peptide, etc. from function. So, peptide is the name of protein small molecule, and the smallest structure of protein is amino acid.