And then DNA fragments were purified from agrose gels using the AccuPrep gel purification kit and ligated into plasmid DNA digested with compatible restriction site. Next the pds cassette from pPlat-pds was amplified using PrimeStar HS DNA polymerase and primer; pdsSHindIIIF, pdsLHindIIIF,for pBS-pds short(S) and long(L),respectectively. Then the pds cassette from pGend-ble was amplified using EX-Taq DNA polymerase and primers blepGenDKpnIF and blepGenDXhoIR or it was amplified using Primestar HS DNA polymerase and primers blepGenDBamHIF and blepGenDXbaIR