1. A relationship was found between selenium concentrations and glutathione peroxidase (EC 184.108.40.206) activities in whole blood of 264 New Zealand residents (r 0.71, P < 0.001).
2. New Zealand residents returning from visits overseas of 7 months to 3 years had elevated blood Se, but normal GSH-Px activities, whereas for some new settlers in New Zealand both Se and GSH-Px activities were high.
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