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Numerous changes occur with human erythrocyte aging in vivo, including an increase in free ionic intracellular calcium concentration ([Ca 2+ ] i ) (N.R. Aiken et al. (1992) Biochim. Biophys. Acta 1136, 155-160). An attractive hypothesis of cell aging suggests that oxidative stress is responsible for many age-related changes. To determine whether oxidative stress leads to increased...