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Fig. 1. Telomere structure and distribution of proteins in polytene chromosomes X, 2R and 3R. (A) Electron microscopy. (B,E) FISH of TAS X probe. (C,F-I) Chromosome localization of chromatin proteins in telomeric regions: SUUR (C), PC (F), E(Z) (G), H3Me3K9 (H), H3Me3K27 (I). (D,E) Induction of swellings in UAS-SuUR+/+; Tel/ru h SuUR Sgs3-GAL4. (D) Orcein staining. (B,C,E-I) Merged image of the phase contrast (black and white) and immunofluorescence (red). Black arrowheads indicate the cap regions, white arrowheads show IH regions. Swellings are marked by arrows. Dashed lines, TAS repeats; solid lines, marker regions. Bars, 1 µm.