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The constancy of zygotic centrosome number is disrupted in class II zyg-1 mutants. For each of the class II alleles, the distribution of centrosome number (MTOCs, microtubule-organizing centers) in live and fixed one-cell embryos was determined. For each allele, the percentage of embryos with one, two, or more than two centrosomes is given in the inset. Although not shown, wild-type one-cell embryos always have two centrosomes.
