#layer.anatomical_structure  thin structure composed of a single thickness of cells
  supertype:  #anatomical_structure__structure__complex_body_part__bodily_structure__body_structure  a particular complex anatomical structure; "he has good bone structure"
  subtype:  #blastoderm__germinal_disc__blastodisc__germinal_area  a layer of cells on the inside of the blastula
  subtype:  #hypodermis  layer of cells that secretes the chitinous cuticle in e.g. arthropods

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