mouse TS23
  embryo
  cavities and their linings
  limb
  mesenchyme
  vertebral axis muscle system
  organ system
  gland
  visceral organ
  nervous system
  integumental system
  sensory organ
  ear
  eye
  nose
  meatus
  naris
  nasal capsule
  nasal cavity
  nasal septum
  naso-lacrimal duct
  turbinate bones
  vomeronasal organ
  cardiovascular system
  skeleton
  tail
  extraembryonic component