PMC:7272971 / 13226-13767 JSONTXT

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Furthermore, lactoferrin that is present in high concentrations in tears (2 mg/ml) 47 prevents viral attachment to heparan sulfate. 19 The ocular surface appears to possess the SARS‐CoV‐2, SAR‐CoV and NL63 receptor ACE2, but may not possess the TMPRSS2 or Furin proteins, which is required for the spike protein of SARS‐CoV‐2 to bind to 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