<p>Peritonitis was induced in wild type (C57BL/6J) or CD44−/− animals by injection of 2.5 ml of thioglycollate. At time points indicated, estimates of the total cell counts and percentage of cell types present in the peritoneal lavage fluid was made by microscopy and flow cytometry and the total counts for different cell populations calculated. Data are mean cell numbers ± SEM from 5 separate experimental animals. Black bars: neutrophils, dark grey bars: macrophages, grey hatched bars: lymphocytes, white hatched bars: eosinophils, other bar: mast cells.</p