fate maps: 2 a1
|  
       Stage 32-cell  | 
    blastomere a1 |  
       contributes to: 
  | 
    |||
| animal | major: | moderate: | minor: | ||
| ventral |   
       | 
    dorsal |  
       retina, brain, spinal chord, cement gland, olfactory placode 
  | 
     
       cranial ganglia, neural crest, lens, head epidermis 
  | 
     
       otocyst 
  | 
  
| branchial arch | central and head somites, heart, notochord | ||||
| pharynx, foregut | liver, archenteron roof, ventral hindgut | ||||
| vegetal | mapping data based upon Moody (1987) | ||||
