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(A) Plot of cleavage kinetics of RzB in spermidine: 0.5 mM (asterisks); 1 mM (circles); 5 mM (triangles); 10 mM (diamonds); 20 mM (squares). (B) Plot of cleavage kinetics of RzB (filled symbols) and RzB0 (open symbols) in 1 mM Mg2+ (diamonds) or in 1 M Na+ (circles). Data for Mg2+ are from Roychowdhury-Saha and Burke (2006).
