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Glutaraldehyde cross-linking analysis of e55K. e55K was incubated with increasing concentrations of glutaraldehyde (%GA): lanes 1 to 9: 0, 10−4, 3 × 10−4, 10−3, 3 × 10−3, 10−2, 3 × 10−2, 10−1, and 3 × 10−1%, respectively. The positions of molecular mass markers (kilodaltons) are indicated. The positions of the monomeric and dimeric forms of e55K are indicated by arrows.
