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Fig. 1. lacI-HP1 fusion protein co-localizes with endogenous HP1. Polytene chromosomes from expressor stock LH2, expressing lacI-HP1, were squashed and stained with antibodies to HP1 (red) and antibodies to lacI (green). The chromocenter (C) and telomeres (T) are indicated. Complete co-localization is observed as yellow in the merged image.