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Schematic representation of Drosophila chromosome ends. From a distal to a proximal direction chromosome ends contain the terminin-associated region (red), the HTT array that may either repress (dark blue) or not repress (light blue) the expression of transgenes; the TAS sequences (orange) or different chromatin types: constitutive heterochromatin (Het, gray), or the specialized 4th chromosome chromatin (Het, dark green).
