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A: representative image of the lumen (white), wall (black), and gap (gray) of an arteriole (order 4). B: measured gap size between the porcine coronary vessels and myocardium from order 0 to 10 vessels of the endocardial (Endo), midmyocardial (Mid), and subepicardial (Subepi) regions. Lines represent a log-linear fit to the mean gap size. Error bars are ±SE. There were no statistical differences in gap size between the layers.
