cistron
noun
                                                                                                                            
                                                            cis·tron
                    
                                                                                                              
                                                                                                                                  ˈsi-ˌsträn  
                                                      
                                                          
            
                                
              
          
                                                      : a segment of DNA that is equivalent to a gene and that specifies a single functional unit (such as a protein or enzyme)                                      
                
                    
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  Merriam-Webster unabridged




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