Schematic diagram of the pPICZαA-P4Hα2 and PHIL-PDI constructs. (a) Construction of the expression plasmid pPICZαA-P4Hα2. (b) Construction of the expression plasmid PHIL-PDI. (c) Nucleic acid electrophoresis of recombinant plasmid pPICZαA-P4Hα2 and PHIL-PDI. M: DNA Ladder 10000; lane 1: the monoclones of recombinant plasmid pPICZαA-P4Hα2; lane 2: the monoclones of recombinant plasmid PHIL-PDI.