Step Total Activity Specific Activity Yield units units/mg % filtrate of pea seedling homogenate 28204.22 1.08 100 30% A.S.1 fractionation 25941.98 1.23 92 70% A.S. fractionation 23173.61 3.62 82.3 DEAE-cellulose chromatography 14638.97 4.07 52 Sephadex G-200 chromatography 13143.66 8.85 46.6 1:ammonium sulfate

Table 1: Purification steps of PSAO. The data have been normalized to a starting value of 1 kg of plant tissue.