#embryonic_cell__embryoniccell__formative_cell__formativecell  a cell of an embryo
  supertype:  #cell  the basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
  subtype:  #blastocyte  an undifferentiated embryonic cell
  subtype:  #ameloblast  a cell from which tooth enamel develops
  subtype:  #osteoblast__bone-forming_cell  a cell from which bone develops
  subtype:  #erythroblast  a nucleated cell in bone marrow from which red blood cells develop
     subtype:  #sideroblast  an erythroblast having granules of ferritin
  subtype:  #fibroblast  a cell from which connective tissue develops
  subtype:  #neuroblast  a cell from which a nerve cell develops

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