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Residual activities of FTE (□), FTEII (▪), FBA (•), and PhyC-R (○) after 10 min of heat treatment at pH 7.5 (A and B) or 5.5 (C and D) in the presence of 1.0 (A and C) or 5.0 (B and D) mM CaCl2. Points represent the means for at least three independent determinations (coefficient of variation, <5%).
