Fig 4. Plasma concentrations (ng/ml) of the endogenous opioids β-endorphin, dynorphin and leu-enkephalin in rat myocardium upon ischemic LPC (Sham, 0, 2, 4, 8, 12 and 24 hours after the ischemic stimulus was initiated).

Data are presented as mean±SD, *P<0.05 vs. 0 hours.