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        Identifying Different Types of Chromatin Using Giemsa Staining

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        Mixtures of polychrome methylene blue-eosin Y (i.e., Giemsa stain) are widely used in biological staining. They induce a striking purple coloration of chromatin DNA (the Romanowsky-Giemsa effect), which contrasts with the blue-stained RNA-containing cytoplasm and nucleoli. After specific prestaining treatments that induce chromatin disorganization (giving banded or harlequin chromosomes), Giemsa staining produces a differential coloration, with C- and G-bands appearing in purple whereas remaining chromosome regions are blue. Unsubstituted (TT) and bromo-substituted (BT) DNAs also appear purple and blue, respectively. The same occurs in the case of BT and BB chromatids.
        In addition to discussing the use of Giemsa stain as a suitable method to reveal specific features of chromosome structure, some molecular processes and models are also described to explain Giemsa staining mechanisms of chromatin.
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