title: Electron microscope analysis of the E polytene chromosome of Drosophila subobscura: region 70B to 72D.
abstract: Revision of the reference map of the polytene chromosomes of Drosophila subobscura was started by means of the electron microscope. We present a map of regions 70B to 72D of the E chromosome obtained from squashed and thin-sectioned salivary glands. It was observed that the total number of bands in divisions 70B to 72D is considerably higher than those depicted in the reference map of Kunze-Mühl and Müller. Functional considerations are made of some regions that show puff structures.
authors.affiliation: Departamento de Genética, Facultad de Ciencias Biológicas, Valencia, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Pérez-Alonso
authors.forename: J B
authors.initials: JB
authors.lastname: Cuenca
authors.forename: R
authors.initials: R
authors.lastname: De Frutos
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000378:metabolism / Q000648:ultrastructure*; D004330:Drosophila / Q000033:anatomy & histology / Q000235:genetics*; D008854:Microscopy, Electron; D014158:Transcription, Genetic