Lacking catalase, a protistan parasite draws on its photosynthetic ancestry to complete an antioxidant repertoire with ascorbate peroxidase

Table 1 Ascorbate peroxidase purification from P. marinus

Enrichment Step	Total protein mg	Specific activity μM min^− 1 mg^− 1	Yield %	Purification -fold
Osmotic lysis	16.1	0.49	100	1.0
DEAE sephacel	2.85	6.63	238^a	13.7
Phenyl sepharose	0.033	493.5	206^a	1007

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