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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 4
 
 M - Musculo-skeletal systemM09 - Other drugs for disorders of the musculo-skeletal systemM09A - Other drugs for disorders of the musculo-skeletal systemM09AX - Other drugs for disorders of the musculo-skeletal system
 
 M09AX01 - Hyaluronic Acid
 
 
 
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