Leukocyte adhesion in TNF-α–treated cremaster muscle venules. Leukocyte adhesion (cells/mm²; mean ± SEM) was observed in TNF-α-treated (2–4 h) venules of the cremaster muscle from Slc35c1^−/− mice, Slc35c1^bm−/− mice, and littermate control mice (A). In addition, leukocyte adhesion efficiency (adherent leukocytes per mm²/systemic leukocyte count) is shown for the various groups (B). *Significant differences (P < .05) in leukocyte adhesion and adhesion efficiency between Slc35c1^−/− mice, Slc35c1^bm−/− mice and littermate control mice.