#long_bone__os_longum  in vertebrate animals: a long cylindrical marrow-containing bone of a limb
  supertype:  #bone__os  rigid connective tissue that makes up the skeleton of vertebrates
  subtype:  #epiphysis  #diaphysis  #arm_bone  #leg_bone
  part:  #endosteum  vascular membrane that lines the inner surface of long bones
  part:  #metaphysis  the growing part of a long bone between the diaphysis and the epiphysis

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