document: Bioproduction of 3WJ scaffold packaging VLPs. The vectors pCDF-QβCP (stpR) and pET28-b(+)-3WJ (KanR) were transformed into E. coli strain BL21 (HIT-21®, RBC, USA) to produce 3 WJ scaffolds packaged in VLPs without fluorescent protein (Qβ@b-3WJ).