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Size exclusion chromatography profiles of affinity purified hu3S193 scFv (−1) isolated from (A) soluble protein fraction, predominantly as trimer (Mr ~81 kD), (B) urea-solubilized fraction, (C) rechromatography of the hu3S193 (−1) trimer peak from panel B, and (D) rechromatography of the hu3S193 (−1) trimer peak from panel B after 2 wk storage at 4°C showing formation of tetramer, monomer, and the VL cleavage fragment.
