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Expression and purification of recombinant NP of SARS-CoV-2 in E. coli. (A) Detection of recombinant NP through SDS-PAGE under different conditions. M: marker, 1: before IPTG induction, 2: after isopropyl β-d-1-thiogalactopyranoside (IPTG) induction, 3: supernatant, 4: insoluble fraction. (B) Purified recombinant NP. M: marker, 1: purified recombinant NP.
