Bar graph shows neointimal cross-sectional area in rabbit iliac arteries 14 days after balloon injury (hatched bars) or stent injury (solid bars). Administration every 48 hr of M1/70, an antibody directed against the α subunit of Mac-1, reduced intimal size. ∗, P < 0.05 compared with NaCl-treated group, P < 0.02 compared with IgG-treated group. †, P < 0.01 compared with NaCl-treated control group, P < 0.005 compared with IgG-treated control group.