Performance of the best 3 tested CEX and AEX resins using 2.0 pH unit gradients for BsAb#6. Resins: (A) MonoS (gradient from pH 6.10 to 8.10), (B) SOURCE 30S (gradient from pH 6.15 to 8.15), (C) SP Sepharose High Performance (gradient from pH 6.38 to 8.38), (D) MonoQ (gradient from pH 9.66 to 7.66), (E) SOURCE 30Q (gradient from pH 10.09 to 8.09), (F) Q Sepharose High Performance (gradient from pH 9.52 to 7.52).