title: Quaternary structure of chromatin.
abstract: Neutron scattering experiments on chromatin solutions have been carried out at Bragg spacings several times larger than in any previous x-ray work. A new series of very low angle reflections at about 400, 200, and 140 A were observed. These reflections demonstrate the existence of a higher order structure of the 100 A unit fibril. A coiled-coil model with a major pitch of 500 A and a radius of center to fibril center of 130 A is proposed to explain the results.
mesh_terms: D000818:Animals; D002417:Cattle; D002843:Chromatin; D008958:Models, Molecular; D011487:Protein Conformation; D012542:Scattering, Radiation; D013950:Thymus Gland / Q000032:analysis
chemical_list: D002843:Chromatin