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Confirmation of the SARS-CoV-2 VHH expression in WK6 bacterial systems. The total protein expression of various bacterial colonies was tested using SDS-PAGE after the expression was induced by IPTG (0.4 mM). The representative image of the gel before the purification of VHH protein is shown. The red arrow points to VHH lines. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
