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Fig. 2. Loose chromocenter morphology of salivary gland polytene chromosomes of Su(var)3-7 or Su(var)2-5 mutants. (A) Severe Su(var)3-714/Su(var)3-79 mutant, and (B) less-affected Su(var)3-714 homozygote. (C) Wild-type control. (D) HP1 mutant: Su(var)2-504/Su(var)2-505. Chromosomes are stained with orcein. Arrows point at granules and dotted arrows at fibers.