GST Pull Down Assay to Study PIF4 Binding In Vitro Springer Nature Link Human viperin catalyzes the modification of GPP and FPP potentially affecting cholesterol synthesis Mikulecky 2018 FEBS Letters Wiley Online Library Affinity chromatography columns, HiTrap protein G HP VWR, part of Avantor A novel approach for separating bacteriophages from other bacteriophages using affinity chromatography and phage display Scientific Reports Glutathione Sepharose and prepacked columns