Figure 2 .

Condensation state of larval neuroblast chromosomes in gwl–endos–PP2A/B55 module mutants. Brains were dissected from late third-instar larvae, treated with colchicine, and squashed; chromosomes were visualized with Hoechst 33258. Genotypes: wild type (Canton S); endos^215-4/endos^215-4; gwl⁷¹⁶/gwl⁷¹⁶ ; endos^215-4 gwl⁷¹⁶/endos^215-4 gwl⁷¹⁶ ; endos^215-4 twins^P/endos^215-4 ; and gwl⁷¹⁶ twins^P/gwl⁷¹⁶. Chromosomes are undercondensed in endos and gwl mutants, but heterozygosity for twins^P suppresses this phenotype.