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47.If the drug proves effective in human trials，it could enhance the effectiveness of existing AIDS drugs in___________________. 48.What has become standard cocktail therapy? 49.While integrase deletes an immune cells genetic material and replaces it with its own，it acts like_____________in a word processor. 50.Why would anti-AIDS drugs stop working? 51.According to Steven Young，if scientists get the data that_______，they would petition for fast track status. | 
