Defects in actin cytoskeleton in the mof1heterozygotes. Early embryos (0–2 h) were stained with β-actin (green) antibody in both yw67c23 and mof1 embryos. PI is used to stain the DNA. The honeycomb like structure which is characteristic of actin cytoskeleton is largely disrupted by the mof mutation. There are few cells which do not have chromsomes in them indicating abnormal nuclei which have been dropped into the cortex and digested by the yolk nuclei. Bar indicates 10 μm scale.