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A, Internal diameters decreased and B, spontaneous vasomotor tone (calculated as [(IDmax – IDrest)/IDmax] × 100%) increased with vessel branch order (FA, 38 ± 3%; 1A, 44 ± 2%; 2A, 55 ± 2%; 3A, 66 ± 2%). Summary data are the mean ± SE; n = 11. * P < 0.05, main effect of branch order.
