There exists an enormous variety of different peptides. Theoretically, knowing that there are 20 distinct amino-acids, the number of peptides different formed from 10 amino-acids is of 20^10 (=10 240.000.000 000 =~10^13).
One calls bipeptides or dipeptides peptides comprising two amino-acids, like the Aspartame, and tripeptides those comprising three amino-acids. For longer peptides, one speaks generally simply about " peptides" or of polypeptides for the amino-acid sequence of at the base of the Protein S.
After the constitution of the peptide chain, an end is carrying an amine group free - the end N or amino-final, and the other of a carboxyl group - end C or carboxyl-final. In certain cases these groups, just like the side chains of the amino-acid , can be modified. By convention, and also because of the direction of their synthesis, the peptide sequences are always considered in the direction NR towards C. For the amino-acid dicarboxylic or diamines, one specifies carboxyl or the amine engaged in the peptide Liaison.
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