Figure 3. The SAXS form factor with the fit result.

The form factor fit includes 52 ± 4% monomer as monomer and 48 ± 4% monomer in dimers and a background contribution (bgr). The dashed line shows the combined monomer-dimer scattering, the red line shows the contribution of the dimer, while the blue line shows the monomer, all without the residual background. The remaining peak at 1.65 nm⁻¹ might be due to bending inside of the Fab fragments. The graphics show the resulting structure of the monomer with colouring of the chains as in Fig. 1 while the two chains of the dimer are coloured red and blue, both with a grey surface. Figures created with PyMOL (www.pymol.org).