Mitotic abnormalities of lmg alleles in orcein stained larval neuroblasts. Wild-type mitotic cells in prometaphase (A), metaphase (B) and anaphase (C). Neuroblast cells from different lmg mutants show prometaphase- or metaphase-like arrest with overcondensed chromosomes and polyploidy (D-K). Chromosome overcondensation could also be observed in anaphase figures (N and O), together with scattered chromosome segregation (L and M). Many cells appear polyploid (G, K and O), and they invariantly have overcondensed chromosomes.