#red_blood_cell__redbloodcell__RBC__erythrocyte  a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus
  supertype:  blood_cell__bloodcell__blood_corpuscle__bloodcorpuscle__corpuscle  either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets
  substance:  hemoglobin
  subtype:  megalocyte__macrocyte  abnormally large red blood cell (associated with pernicious anemia)
  subtype:  megaloblast  abnormally large red blood cell present in pernicious anemia and folic acid deficiency
  subtype:  acanthocyte  an abnormal red blood cell that has thorny projections of protoplasm
  subtype:  microcyte  an abnormally small red blood cell (less than 5 microns in diameter)
  subtype:  reticulocyte  an immature red blood cell containing a network of filaments or granules
  subtype:  sickle_cell  an abnormal red blood cell that has a crescent shape and an abnormal form of hemoglobin
  subtype:  siderocyte  an abnormal red blood cell containing granules of iron not bound in hemoglobin
  subtype:  spherocyte  an abnormal spherical red blood cell
  subtype:  target_cell  an abnormal red blood cell with a ringed appearance; associated with anemia

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