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Ixed in 10 NBF for 24 hrs, processed using standard histological procedures, embedded, then cut into 5 m sections. Strain differences in pulmonary neutrophil infiltration were evaluated using peroxidase biotin-streptavidin immunohistochemistry, and bound enzyme was visual-Rondini et al. Particle and Fibre Toxicology 2010, 7:9 http://www.particleandfibretoxicology.com/content/7/1/Page 4 ofized usi