St06a-3.0hpf

32-cell embryo (3.1 hours). All blastomeres have undergone a fifth cleavage, which occurs earlier in the vegetal than animal lineages. Division of B5.2 is again markedly asymmetric due to the action of the CAB, leading to a small posterior B6.3 cell. This stage is split into early 32-cell (stage 6a), which is quasi spherical, and late (stage 6b) which is flatter and in which the large B6.2 cell is bulging out.

Two-headed arrows indicate the pair of daughter cells. The number of cell-lineages are drawn on each blastomere. Scale bar = 50 micro m.