A. Collar induced an increase in MMP-9 staining in collared arteries both in placebo and lacidipine group (* P <0.05, sham vs. collar, n=5 and 4, respectively; each measurement was performed in duplicate, two way ANOVA, Bonferroni posttest). B. Comparison of the staining intensity of intimal area or total wall in collared arteries from placebo group for MMP-9. C. Photomicrographs of immunohistochemically stained rabbit carotid arteries for MMP-9. D. Nitrotyrosine staining was not changed neither by collar nor lacidipine treatment.