A, HOXA4 protein levels were measured in left ventricle (LV) lysates from Hoxa4 knockout (KO) mice compared to wild type (WT) controls. Data are shown as mean ± SEM from N=3 per group. Unpaired 2-tailed t-test. B-F, Transthoracic echocardiography was performed at 0, 1 week and 2 weeks post-MI. Quantification of ejection fraction (EF: B), fractional shortening (FS: C), stroke volume (SV: D), end systolic volume (ESV: E) and internal diameter, systole (LVIDs: F) is shown. Data are shown as mean ± SD from N=4 per group. Two-way repeated-measures ANOVA with Bonferroni post hoc test.