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SUMMARY.— Two brothers with hereditary angio‐oedema have been studied, the only 2 cases among 227 patients with angio‐oedema seen in 10 years. The absence of the inhibitor of the activated first component of complement in their serum confirmed the diagnosis. In a double blind trial their symptoms were partially controlled by ε ‐ aminocaproic acid, although there were no consistent changes in the serum complement levels.
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Champion et al. (1969) studied this question.
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