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Figure 4.
Figure 4. X-ray distance distribution functions P(r) for
CR2 SCR 1-2, C3d, and their complex. The maximum M of each P(r)
curve shows the most frequently occurring distance within each
molecule. The maximum dimension is denoted by L. (a) For CR2 SCR
1-2, M occurs at 2.1 nm and L at 10 nm. (b) For C3d, five
different sample concentrations are shown at 0.5 mg ml -1 (red),
0.8 mg ml -1 (orange), 1.1 mg ml -1 (green), 2.1 mg ml -1
(blue), and 3.73 mg ml -1 (pink) from bottom to top. The three
broken lines represent P(r) curves whose intensities have been
increased by factors of 8.5 (0.5 mg ml -1), 7.0 (0.8 mg ml -1),
and 5.5 (1.1 mg ml -1) for clarity. Peak M[1] corresponds to
monomeric C3d and peak M[2] corresponds to its dimer. (c) For
the complex, M occurs at 3.0 nm and L at 9 nm.
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