FIGURE 4. Maps of local deposition densities of ³H-adenosine (n = 120) in left ventricular free wall during intracoronary alprostadil infusion. (A) Scheme of sample preparation. (B) Sample groups along base to apex axis represent 5 slices from left ventricular free wall starting with slice 1 on left (base) to slice 5 on right (apex). Each slice contains data from 6 sectors starting with sector 1 (bottom) and ending with sector 6 (top). Four layers of myocardium are ordered from inner (subendocardium) to outer (subepicardium). Data are from experiment 7. Subend = subendocardium; subep = subepicardium.