[Cytochemical data on histones of the heterochromatins and euchromatins of Triatoma infestans Klug (author's transl)].

In cells of the Malpighian tubes of Triatoma infestans Klug, the histone content reactive to the alkaline fast green method does not remarkably differ when nuclei with various heterochromatic patterns (T1 and T8) are compared to each other. The fast green-histone values for the euchromatins (and heterochromatins) of both nucleus types also appear not differing. However, the possibility that these histones are differently linked to DNA in euchromatin or heterochromatin variants is not to be ruled out. Cytochemical evidence is suggestive of a lysine-richness in the histones of the mentioned hetero- and euchromatins.