#donor  (medicine) someone who gives blood or tissue or an organ to be used in another person (the host)
  supertype:  #benefactor__helper  a person who helps people or institutions
  subtype:  #blood_donor  someone who gives blood to be used for transfusions
     subtype:  #universal_donor  a person whose type O Rh-negative blood may be safely transfused into persons with other blood types
  subtype:  #organ_donor__organdonor  someone from whom an organ is taken for transplantation

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