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Annexin V-FITC/PI staining of A431 cells. (a) Cells were treated with or without Brazilian green propolis (BGP) extract in protoporphyrin IX-mediated photodynamic therapy (PpIX-PDT) and stained using Annexin V-FITC/PI staining assay before detection by a BD AccuriTM C6 flow cytometer. All groups were illuminated by laser; (b) The percentages of apoptotic cells.
