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Binding activity of 4S1 phage binder to native S protein. Commercially available Biochips, precoated with SARS-CoV-infected Vero E6 cells were immunostained, respectively, with sera from a convalescent-stage patient (A), un-infected person (B), post- (C) and pre-immunized (D) chickens, 4S1 phage (E) and wild-type M13 phage (F).
