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.