All

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 A11 Cells D002477 +
  A11.118 Blood Cells D001773 +
   A11.118.637 Leukocytes D007962 +
    A11.118.637.555 Leukocytes, Mononuclear D007963 +
     A11.118.637.555.567 Lymphocytes D008214 +
      A11.118.637.555.567.537 Killer Cells, Natural D007694 +
       A11.118.637.555.567.537.500 Killer Cells, Lymphokine-Activated D015979 
 A15 Hemic and Immune Systems D006424 +
  A15.145 Blood D001769 +
   A15.145.229 Blood Cells D001773 +
    A15.145.229.637 Leukocytes D007962 +
     A15.145.229.637.555 Leukocytes, Mononuclear D007963 +
      A15.145.229.637.555.567 Lymphocytes D008214 +
       A15.145.229.637.555.567.537 Killer Cells, Natural D007694 +
        A15.145.229.637.555.567.537.500 Killer Cells, Lymphokine-Activated D015979 
 A15 Hemic and Immune Systems D006424 +
  A15.382 Immune System D007107 +
   A15.382.490 Leukocytes D007962 +
    A15.382.490.555 Leukocytes, Mononuclear D007963 +
     A15.382.490.555.567 Lymphocytes D008214 +
      A15.382.490.555.567.537 Killer Cells, Natural D007694 +
       A15.382.490.555.567.537.500 Killer Cells, Lymphokine-Activated D015979