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Serum ACE2 levels and severity. (A) ACE2 serum levels determined by ELISA in the indicated patients groups (B) The fraction of samples with low ACE2 (ACE2<7.3, lowest 25% of all samples), ***p<0.0001. (C) The fraction of samples with high ACE2 (ACE2>12.3, highest 25% of all samples).
