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. 2011 May 12;4(4):317–327. doi: 10.1007/s12410-011-9092-6

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© The Author(s) 2011

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Fig. 7 — Effects of nitroglycerin (NTG) on subendocardial myocardial blood flow. A and B, Before and 3 min after the intravenous injection of 200 μg NTG, respectively. The endocardial color changed from white to red, indicating increased blood flow (arrow in B). (From Uchida [7]; with permission)