title: Electron microscopy of defined lengths of chromatin.
abstract: Defined lengths of chromatin were prepared by brief digestion with micrococcal nuclease and fractionation in a sucrose gradient. A length containing a given number of 200 base pair repeating units appeared as the same number of 100 A beads in the electron microscope. The distance between beads within a length was small, usually less than about 20 A.
mesh_terms: D002843:Chromatin / Q000032:analysis / Q000648:ultrastructure*; D008954:Models, Biological; D008970:Molecular Weight
chemical_list: D002843:Chromatin