Upper level: s4  Structures of the cardiovascular, immunological and respiratory

s420  Structure of immune system

Lower livel:

• s4200  Lymphatic vessels

• s4201  Lymphatic nodes

• s4202  Thymus

• s4203  Spleen

• s4204  Bone marrow

• s4208  Structure of immune system, other specified

• s4209  Structure of immune system, unspecified

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