MMP14 and myocardial infarction: Echocardiography revealed that Mφ-inactivation of Mmp14 ameliorated LV dysfunction and prevented LV dilation post-MI, with MAC-Mmp14 KO mice having a significantly higher LV ejection fraction (LVEF) and lower LV end-diastolic volume (LVVold) (Figure 1B–C, and Video 1).