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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 5
 
 V - VariousV09 - Diagnostic radiopharmaceuticalsV09E - Respiratory SystemV09EX - Other respiratory system diagnostic radiopharmaceuticalsV09EX01 - Krypton (81mKr) gas
 
 Krypton (81mKr) gas
 
 
 
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