title: [Helical structure revealed upon the beta heterochromatin of polytene chromosome of Drosophila virilis].
abstract: By using conventional electron microscopy, beta heterochromatin of polytene chromosome of Drosophila virilis was composed of 80-100nm chromonemas. Helical structures consisting of the 30nm chromatin fibres were identified in the chromonema. Based on these observations, the radial loop model and the multiple coiling model were discussed.
authors.affiliation: Department of Biotechnology, Harbin Institute of Technology, Harbin 150001.
authors.forename: Jie
authors.initials: J
authors.lastname: He
authors.forename: Yi Ling
authors.initials: YL
authors.lastname: Mi
authors.forename: Shui
authors.initials: S
authors.lastname: Hao
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000737:chemistry* / Q000235:genetics / Q000648:ultrastructure*; D004330:Drosophila / Q000235:genetics* / Q000648:ultrastructure*; D006570:Heterochromatin / Q000737:chemistry* / Q000235:genetics / Q000648:ultrastructure*; D046529:Microscopy, Electron, Transmission
chemical_list: D006570:Heterochromatin