Supplementary Fig. A1.

Recruitment of neutrophils to the brain 4 h after intracerebral injection of 1ng IL-1β during postnatal period. Photomicrographs show neutrophils (brown; anti-neutrophil serum) and vessels (pink; laminin) in the striatal injection site 4 h after the intracerebral injection of 1ng IL-1β at P7, P14, P21 and P56. These not only show that more neutrophils were present in the brain, but also that more cells were able to migrate into the parenchyma at P14. Scale bar = 50 µm.