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ACE2-binding phages displaying SARS-CoV-2 spike RBD-mimotopes as characterized by an indirect ELISA. Serial dilutions of phages were incubated with a bound ACE2 receptor, followed by incubation with a rabbit anti-phage IgG and an HRP-conjugated goat anti-rabbit IgG. Signal was produced using a TMB substrate and endpoint absorbance at 450 nm was measured after a 30-min incubation. Candidate RBD-binding phages were compared to the wildtype fd-tet phage (dark green).
