A. Myocardial infarct size (% of RA) measured 24 h post-MI in the various groups. Note that infarct size was significantly reduced with tadalafil, which was blocked by KT and PAG. B. The area-at-risk, expressed as percent of the left ventricle, was similar in all groups. C. Myocardial infarct size measured 24 h post-MI in C57BL wild-type mice, mice treated with DMSO or tadalafil, and in CSE-knockout mice. Note that genetic deletion of CSE abrogated the infarct-sparing effect of tadalafil. D. The area-at-risk was similar in C57BL wild-type mice, mice treated with DMSO or tadalafil, and in CSE-knockout mice.