The Fine Structure of Salivary Chromosomes

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Abstract
The electron microscope was used to investigate salivary chromosomes of Drosophila virilis. fixed with Flemming''s fluid. Formvar-replica and shadow casting techniques were employed. The electron micrographs are interpreted to show that: the interband regions consist of many longitudinal strands (chromonemata) which show a beaded structure with a 30-60 mu periodicity, the matrix may be observed along with the chromonemata, and the chromomeres appear distinctly after treatment with DNA''ase or TCA.