Office of NIH History  
In Their Own Words: NIH Researchers Recall the Early Years of AIDS
  Fluorescence-activated cell sorter (FACS)  
   
  Fluorescence-activated cell sorter (FACS) used a laser beam aimed at a stream of cells to measure the number of infected cells.  
     
  Fluorescence-activated cell sorter (FACS) employs a laser beam aimed at a stream of cells to measure the number of infected cells  
     
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