FIG. 6.

Coomassie blue-stained SDS-polyacrylamide gel of chemically cross-linked VP5CT. VP5CT, untreated or cross-linked with BS³ (indicated above lanes), was boiled in reducing SDS-PAGE sample buffer and separated on a 4-to-15% polyacrylamide gradient gel. Molecular mass standards are identified in kilodaltons adjacent to the marker bands.