Arterial occlusion time in the CSS backcrosses. Occlusion time was determined in heterosomic mice, (B6xCSS-5)F1 (5F1) and (B6xCSS-17)F1 (17F1), and doubly heterosomic mice for chromosomes 5 and 17 (5 × 17). Bars are the mean ± SEM of 5–18 mice. Statistical differences between B6 mice and CSS were determined with a t-test, and a Bonferroni correction was made to determine significance value (P < 0.02). Symbols indicate a significant difference between B6 values. *P < 0.0001.