Top panels illustrate the in vivo potential of blastula stem cells (ectoderm, mesoderm, and endoderm) and neural crest cells (ectodermal: pigmentation, peripheral glia, sensory neurons and mesenchymal: connective tissue, cartilage/bone, dermis). Bottom panels show common gene regulatorys circuitry for blastula stem cells and neural crest factors. Circuity is grouped in boxes by shared (blue), ESC-specific (orange), and neural crest-specific (green) gene regulatory elements.