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Manganese superoxide dismutase (SOD-2) activity was measured in erythrocytes and leukocytes of a patient with ring chromosome 6. Compared to normal control individuals, SOD-2 activity in leukocytes of the patient was lower, whereas cuprozinc SOD (SOD-1) activity was normal. These findings suggest the cause of decreased enzyme activity is the effect of the ring form on production of the enzyme or inherent instability of ring chromosomes.
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Yoshimitsu et al. (1987) studied this question.
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