All
 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 +
 A15.382.490.555.567.569 T-Lymphocytes D013601 +
 A15.382.490.555.567.569.200 CD4-Positive T-Lymphocytes D015496 +
 A15.382.490.555.567.569.200.400 T-Lymphocytes, Helper-Inducer D006377 +
 A15.382.490.555.567.569.200.400.900 Th1 Cells D018417 
 A15.382.490.555.567.569.200.400.905 Th2 Cells D018418