[Regulation of transcription in eukaryotic cells: chromosomal transcription].

In situ hybridization of the endogenous chromosomal RNA to the chromosomal DNA allowed us to detect that most of the subregions of the salivary gland polytene chromosomas of Drosophila melanogaster transcribe RNA although at different rates. The DNA melting curves of two chromosomal subregions showed that there should be some correlation between the rate of transcription and the macromolecular architecture of the nucleoprotein.