Cultured cell phenotypes were analyzed through direct immune fluorescence staining of cell surface antigens using fluorescein isothiocyanate (FITC), peridinin-chlorophyll-protein (PerCP), phycoerythrin (PE), or Allophycocyanin (APC) conjugated antibodies against MHC I/II, CD11c, CD80/86 and CD14 (eBioscience) by flow cytometry. Fluorescence-labeled IgG isotypes were selected as the control. All antibodies were used at manufacturer-recommended concentrations.