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Fig. 2. Blood flow over the (A,B) dorsal and (C,D) abdominal skin of one winter-acclimatized pigeon (Columba livia). (A) Control. (B) Nitric oxide (NO) gel treatment. (C) Control. (D) NO gel treatment. BPU, blood perfusion unit. The arrow denotes the time of gel application. Stabilized blood flow over a 10-min period is presented as charts based on raw numerical flow data.