Purification and gel filtration analysis of the fusion protein. (A) SDS/PAGE under reducing condition shows the result of purification. Lane M, the molecular mass standards(kDa); lane 1, the fusion protein. The molecular masses in kDa are given on the right of the gel. (B) Gel filtration analysis of the fusion protein on a TSK-G3000-SWXL column. The molecular mass standards are IgG (150 kDa) and BSA (66 kDa).