Blastomeres and neoblasts

Left to right: Illustrations of stage (S) S2 through S8 embryos. Blastomeres (red), neoblasts (blue). The blastomere to neoblast transition occurs during S5. S3-S5: aboral hemisphere (left), oral hemisphere (right). S6-S8: dorsal view (left), ventral view (right).

Illustrations by Mark M. Miller.