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![[Figure 1]](rr5230fig1mag.jpg)
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Figure 1
Comparison of NtC-nonrestrained (a, c) and restrained (b, d) refinement of residue DG4 of Chom-18-CG (a, b) and residue DC18 of Chom-18-TC (c, d). The 2mFo − DFc electron density is contoured in gray at the 1σ level and the mFo − DFc electron density is contoured in green for positive and in red for negative at the 3σ level. Images were drawn with CCP4MG (McNicholas et al., 2011  ). |
![[Figure 1]](rr5230fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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