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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 .
 -Fas ligand, Fas, HIV-infected cells, uninfected cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 -Fas ligand, Fas, HIV-infected cells, uninfected cells