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               1. A method of treating osteoarthritis in a subject, comprising intraarticularly administering a composition comprising a C-type natriuretic peptide (CNP) variant to the subject at a dose of from 5 μg/kg to 800 μg/kg of the CNP variant, wherein the CNP variant is selected from the group consisting of: 
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                
                              
                              
                              
                                
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                                  (SEQ ID NO: 1) | 
                                 
                                
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                                  PGQEHPNARKYKGANKKGLSKGCFGLKLDRIGSMSGLGC | 
                                 
                                
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                                  (Pro-Gly-CNP37); | 
                                 
                                
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                                  (SEQ ID NO: 2) | 
                                 
                                
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                                  GQEHPNARKYKGANKKGLSKGCFGLKLDRIGSMSGLGC | 
                                 
                                
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                                  (Gly-CNP37); | 
                                 
                                
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                                  (SEQ ID NO: 43) | 
                                 
                                
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                                  QEHPNARKYKGANKKGLSKGCFGLKLDRIGSNSGLGC | 
                                 
                                
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                                  [CNP-37(M32N)] | 
                                 
                                
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                                  (SEQ ID NO: 44) | 
                                 
                                
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                                  PQEHPNARKYKGANKKGLSKGCFGLKLDRIGSMSGLGC | 
                                 
                                
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                                  (Pro-CNP37); | 
                                 
                                
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                                  (SEQ ID NO: 45) | 
                                 
                                
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                                  MQEHPNARKYKGANKKGLSKGCFGLKLDRIGSMSGLGC | 
                                 
                                
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                                  (Met-CNP37); | 
                                 
                                
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                                  (SEQ ID NO: 46) | 
                                 
                                
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                                  GQEHPNARKYKGANKKGLSKGCFGLKLDRIGSNSGLGC | 
                                 
                                
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                                  [Gly-CN P-37(M32N)]; and | 
                                 
                                
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                                  (SEQ ID NO: 47) | 
                                 
                                
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                                  MGQEHPNARKYKGANKKGLSKGCFGLKLDRIGSMSGLGC | 
                                 
                                
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                                  (Met-Gly-CNP37). | 
                                 
                              
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