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Fig. 2. Effects of (A) hypoxia (N=12) and (B) acetylcholine (ACh; 1 µmol kg–1) injections (N=7) on blood flow velocity in efferent filament arteries (EFA). •, ACh; {circ}, ACh after atropine injection. Values are means ± S.E.M. and normalized to the proportion (%) of pre-hypoxic velocity. The line indicates a time period significantly different from the last pre-exposure value [P<0.05; non-parametric ANOVA (Freidmann test) with Dunn post-test]. The asterisk indicates a significant difference between atropine treatment and control.