title: An explanation for the rare occurrence of cis peptide units in proteins and polypeptides.
mesh_terms: D000409:Alanine; D000595:Amino Acid Sequence; D002151:Calorimetry; D008433:Mathematics; D008958:Models, Molecular; D010455:Peptides; D011392:Proline; D011487:Protein Conformation; D011506:Proteins
chemical_list: D010455:Peptides; D011506:Proteins; D011392:Proline; D000409:Alanine