of 1 × 105 cells per reaction with a cocktail containing an anti-CD3 monoclonal antibody (mAb) conjugated with Alexa Flour 488 (Alexa 488) (BD Pharmingen), an anti-CD4 mAb labelled with peridinin chlorophyll protein complex (PerCP) (BD Pharmingen) and an anti-CD8 mAb conjugated to allophycocyanin (APC) , an antiCD14 mAb labeled with phycoerythrin (PE) (Ebiosciences)or with a control cocktail of the appropriate isotype mAb controls (Ebiosciences or BD Pharmingen) for 30 min at 4 °C. Using forward versus side scatter, lymphocytes were separated from debris by flow cytometric analysis (gate R1; see Fig. 1b).