2.7.8.29 epitope-tagged recombinant protein 717210 2.7.8.29 recombinant protein 717768 2.7.8.29 anti-FLAG M2 affinity gel chromatography 722906 2.7.8.29 purification of functional recombinant FLAG-tagged PSS2 from HEK-293 and CHO-K1 cell microsomes by ultracentrifugation, immunoaffinity chromatography 722906