But the definition, and the way scientists use each term, is a little loose. As a general rule, a <a href="http://www.biowayorganicinc.com/peptide/" target="_self">peptide</a> contains two or more amino acids. And just to make it a little more complicated, you will often hear scientists refer to polypeptides ¨C a chain of 10 or more amino acids.
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Dr Mark Blaskovich from the Institute for Molecular Bioscience (IMB) at The University of Queensland in Australia says approximately 50-100 amino acids is the cut-off between a peptide and a protein. But most peptides found in the human