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Fig. 5. NO production in the isolated, non-working trout heart preparation. Open bars: perfusion in absence of L-NA; filled bars: perfusion in presence of L-NA. (A) NO production rate during saline perfusion; (B) change in the NO production rate during RBC perfusion; (C) change in the NO production rate after addition of nitrite to RBC perfusate. # signifies that NO production or {Delta}NO production is significantly different from zero. * signifies a significant effect of L-NA.