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          leisure time  
          
                                   
                 
                                      author：explore   
                                        
                                      
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browse：427
                                  
                                    
          
                                    
            
          
 
          An illustration of red blood cells
          Adobe
          As a boy growing up with hemophilia A, Noah Frederick reserved the end of his annual checkups to talk about new technologies. His doctor walked through various experimental approaches for the bleeding disorder and, invariably, gene therapy. It was coming, he always said, in your lifetime.
          Last year, it finally arrived. But Frederick, now a 23-year-old software engineer, isn’t sure he’ll get it. He wants to be part of the sci-fi future gene therapy has always represented, but a recent doctor’s visit left him uncertain. 
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          “I’m on the fence,” he said.
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