2002•PubMedRequires access
[Helical structure revealed upon the beta heterochromatin of polytene chromosome of Drosophila virilis].
Jié He, Yi Ling Mi, Shui Hao
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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.