IL1B and abscess: In the skin abscess model, the application of PEG-PCL-MP1 nanoparticles strongly reduced the pronounced abscess formation and concomitant inflammation (as measured by levels of the cytokines IL-1β and IL-6) observed in the MRSA-infected group, while the application of MP1-only or PEG-PCL nanoparticles only had no effect (Fig. 11a–d).