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Schematic illustration of mucosa cells with glycosylated structures and receptor–ligand interactions. Hormones, antibodies, as well as viruses and bacteria or their toxins, interact with oligosaccharide epitopes (glycoproteins) that serve as receptors or co‐receptors. The suggested interference of ABO antibodies with SARS‐CoV‐2 targeting of host cells via angiotensin‐converting enzyme 2 (ACE‐2) receptor is indicated. Made with Biorender.com
