Abstract
The somatic metaphase chromosomes of C. debile stain differentially with quinacrine and Giemsa respectively. After quinacrine staining the heterochromatic regions show fainter fluorescence than euchromatic regions. With Giemsa the heterochromatic regions are more deeply stained than the euchromatic regions. This is true also for slides which were pre-treated with trypsin or trichloroacetic acid. From these findings it may be supposed, that the heterochromatic regions are G-C rich. Furthermore, differences in protein composition are expected between hetero- and euchromatic regions. The results of differential staining of metaphase chromosomes of C. debile, including those which were published in previous papers, are summarized here.
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