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Cell diameters as a function of cleavage stage in Dendraster. Embryos were dissociated and the blastomeres measured from photographs. One hundred cells were measured for each point. The lineages are indicated by MM (macro-mesomeres), LMi (large micromeres), and SMi (small micromeres), each lineage starting with its own cycle 1. Ciliation occurred at the 21st hour and hatching at 22.5 hours. The diameter achieved at hatching is 12 μm.
