title: Morphological evidence for antiparallel peptide chains in poly glycylprolylproline.
mesh_terms: D003460:Crystallization; D003461:Crystallography; D005998:Glycine; D008854:Microscopy, Electron; D008961:Models, Structural; D008967:Molecular Biology; D008970:Molecular Weight; D010455:Peptides / Q000032:analysis*; D011392:Proline; D014961:X-Ray Diffraction
chemical_list: D010455:Peptides; D011392:Proline; D005998:Glycine