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Figure 4.
Fig. 4. Fourier electron density maps showing TrpL163 in
13G5 Fab for UV-irradiated data set H and native control data
set I. For a and b, the tryptophan residue was refined as
tryptophan, whereas for control (c and d), the tryptophan
residue was refined as alanine to avoid model bias. (a) 2F[o] -
F[c] maps (blue), contoured at 1.0  .(b) F[o] - F[c] maps,
contoured at 3.0 (green) and -3.0 (red).
(c)2F[o] - F[c] maps (blue), contoured at 0.8 .(d)
F[o] - F[c] maps, contoured at 3.0 (green).
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