(A) There was no statistically significant difference in initial infarct size 1 day post-MI between the 3 strains (C57 n = 10, MRL n = 9, LG/J n = 3; P = 0.67.). (B) There were no significant differences in infarct size after 5 days between hearts of animals sacrificed on that day and C57 hearts that ruptured on or before 5 days post-MI (C57 n = 5, C57 ruptured hearts n = 3, MRL n = 4, LG/J n = 4; P = 0.86.). Infarct thickness was not preserved in MRL hearts 5 days post-MI (C); there were no significant differences in infarct thickness between the strains (C57 n = 5, MRL n = 3, LG/J n = 4; P = 0.32.).