ST3GAL4 and Patent ductus arteriosus: PDA cells lines (BxPC-3 and Capan-1) were transduced with five different shRNAs for each target sialyltransferase and the respective sequences were designated as sh-1 to sh-5 for shRNAs against ST3GAL4 and as sh-6 to sh-10 for the ST3GAL3 KD cells.