Office of NIH History  
In Their Own Words: NIH Researchers Recall the Early Years of AIDS
  Polymerase Chain Reaction Test  
   
  Diagram of the polymerase chain reaction test shows how to emplify HIV DNA sequences as a way to diagnose HIV infection in blood samples.  
     
  Diagram of the polymerase chain reaction test (PCR) shows how HIV DNA sequences as a way to diagnose HIV infection in blood samples  
     
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