The gross appearance of the lung in the four groups. A. The Sham group showed pink lung with a little congestion (white arrow). B. The Ischemia group showed a reddish-gray lung with some collapsed appearance (white arrow). C. The Reperfusion group showed a reddish lung with congested and swollen appearance (white arrow) with some dark red appearance indicating bleeding. D. The Inhaled NO group showed a somewhat similar but less congested and swollen lung appearance as the reperfusion group (white arrow).