IL6 and infection: By contrast, pre-treatment of MG-63 cells with 50 μg/mL of MDP, followed by a 5-days resting time, resulted in a significant increase of IL-6 production upon a stimulation with S. aureus (red bar), compared to cells exposed to a cultivation medium, followed by a 5 day-resting time before an infection with S. aureus (yellow bar), whether the MOI was 60:1 or 100:1 (Figure 3B).