1.1.1.200 - 347839, 655664 1.1.1.200 HisTrap column chromatography 762130 1.1.1.200 Ni-NTA column chromatography 741218 1.1.1.200 one-step protein purification by immobilized metal affinity chromatography, N-term tagged protein 95% pure, C-term tagged one 75% pure 696497