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Fig. 6. Relationships between ammonia flux rates (JAmm, over 6 h) and average net driving force for NH4+ (DF) in individual epithelial preparations of series 3 under (A) asymmetrical conditions with basolateral-to-apical fluxes, (B) symmetrical conditions with basolateral-to-apical fluxes and (C) symmetrical conditions with apical-to-basolateral fluxes. The regression equations are as follows: (A) JAmm=–1.4415DF+111.40, r=–0.69, N=18, P<0.05; (B) JAmm=–0.4616DF+21.37, r=–0.28, N=33, P>0.05; (C) JAmm=–0.2370DF+34.40, r=–0.03, N=29, P>0.05. FW, fresh water; L-15, L15 medium.