St08-4.0hpf

64 cell stage (4 hours). The animal blastomeres have now also undergone a sixth cleavage. Seen from the animal pole, the embryo has a rather square shape with A7.8 and B7.4 blastomeres 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.