1.1.1.121 7.3 9.3 66% of maximal activity at pH 7.2 and pH 9.3 in Tris/HCl buffer 285794 1.1.1.121 8 9.8 about 80% of maximal activity at pH 8.0 and 9.8 in Tris/acetate buffer 285791 1.1.1.121 8.5 10.4 about 80% of maximal activity at pH 8.5 and 10.4 in glycine/NaOH buffer 285794