3.4.21.64 - 3.4.21.64 gene encoding proteinase K re-synthesized with an Escherichia coli codon bias and cloned into an arabinose-inducible Escherichia coli expression vector 3.4.21.64 recombinant expression of tagged cellular Bac-prion protein fusion in Spodoptera frugiperda SF21 insect cells via baculovirus transfection system