Figure 2: THP-1 (a), (b) and U937 (c) cells were either differentiated with I F N 𝛾 + V D 3 for 48 h (a) or induced to undergo apoptosis with camptothecin for 24 h (b), (c). Cells are labeled with Alexa-488-Plg or anti-Plg-Rs antibodies against H2B, α-enolase, annexin A2, and p11 followed by Alexa-488-ant-rabbit IgG (c) and analyzed by FACS. Early apoptotic populations are used to analyze the data. Data are m e a n s ± S D of two to three independent experiments and presented as the fold change relative to untreated THP-1 or U937 cells.