Don't Clone Humans!
        
            By Rudolf Jaenisch and Ian Wilmut, 
                Science
             | 03. 30. 2001
        
                    
                                    
                    
                                                                                                                                    
                                                                            
                              
    
  
  
    
  
          
  
      
    
            The successes in animal cloning suggest to some that the technology 
            has matured sufficiently to justify its application to human cloning. 
            An in vitro fertilization specialist and a reproductive physiologist 
            recently announced their intent to clone babies within a year's time 
            (1). There are many social and ethical reasons why we would never 
            be in favor of copying a person. However, our immediate concern is 
            that this proposal fails to take into account problems encountered 
            in animal cloning.
          
Since the birth of Dolly the sheep (2), successful cloning has been 
            reported in mice (3), cattle (4), goats (5), and pigs (6, 7), and 
            enough experience has accumulated to realize the risks. Animal cloning 
            is inefficient and is likely to remain so for the foreseeable future. 
            Cloning results in gestational or neonatal developmental failures. 
            At best, a few percent of the nuclear transfer embryos survive to 
            birth and, of those, many die within the perinatal period. There is 
            no reason to believe that the outcomes of attempted human cloning 
            will be any different. The few cloned ruminants that have survived 
            to...
 
 
  
 
    
    
  
   
                        
                                                                                
                 
                                                    
                            
                                  
    
  
  
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