Protein production was done in HEK293T cells by transient transfection with polyethylenimine in FreeStyle 293 medium. For Fab antibody production, Fab heavy chain expression plasmids were co-transfected with the corresponding light chain. For scFv antibody production, scFv expression plasmid of specific antibody was used for transfection. After 5 days of culture at 37°C and 5% CO2, culture supernatant was harvested and filtered using a 0.22 mm polyethersulfone (PES) filter. Fab and scFv antibody were purified by Strep-Tactin affinity chromatography (IBA lifescience) according to the Strep-Tactin XT manual.

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