Upper level: s  BODY STRUCTURES

s4  Structures of the cardiovascular, immunological and respiratory

Lower livel:

• s410  Structure of cardiovascular system

• s420  Structure of immune system

• s430  Structure of respiratory system

• s498  Structures of the cardiovascular, immunological and respiratory systems, other specified

• s499  Structures of the cardiovascular, immunological and respiratory systems, unspecified

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