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Serum ACE2 and anti-S IgG levels in infected seropositive patients according with the type of symptoms. (A) ACE2 serum levels determined by ELISA in the indicated patient groups ***p<0.001. (B) Detection of anti-S protein antibodies in human patient sera by flow cytometry of Jurkat cells stably expressing the full-length native S protein of SARS-CoV-2.
