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Moreover, the apoptotic process was not related to Fas -Fas ligand interaction ; however, an antagonistic anti-Fas MAb (ZB-4) enhanced apoptosis in HIV-infected cells without inducing apoptosis in uninfected cells .
 ( protein: -Fas ligand, None) , ( protein: Fas, None) , ( cell type: HIV-infected cells, None) , ( cell type: uninfected cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: -Fas ligand, None) , ( protein: Fas, None) , ( cell type: HIV-infected cells, None) , ( cell type: uninfected cells, None) 