title: Conformational properties of Pro-Pro sequences. I. Crystal structures of two dipeptides with L-Pro-L-Pro and L-Pro-D-Pro sequences.
mesh_terms: D000595:Amino Acid Sequence; D004151:Dipeptides; D011392:Proline; D011487:Protein Conformation; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D004151:Dipeptides; D011392:Proline