Sea Urchins and Tunicates: Deuterostome Invertebrates

Early Development in Sea Urchins

  • Early cleavage
  • Blastula formation
  • Fate maps and the determination of sea urchin blastomeres
  • Gene regulatory networks and skeletogenic mesenchyme specification
  • Specification of the vegetal cells

Sea Urchin Gastrulation

  • Ingression of the skeletogenic mesenchyme
  • Invagination of the archenteron

Early Development in Tunicates

  • Cleavage
  • The tunicate fate map
  • Autonomous and conditional specification of tunicate blastomeres