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![[Figure 2]](ap5033fig2mag.jpg)
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Figure 2
(a) Details of the final 2mFobs − DFcalc, αcalc Fourier electron-density map (contoured at 1.5 r.m.s.), with the refined structure shown in stick representation and standard atom colour-coding. (b, c) Anomalous difference (ΔFanom, αcalc) Fourier electron-density map, contoured at 4.0 r.m.s., for (b) the Ca2+ and Mn2+ ions and (c) the S atoms (yellow) at the Met42 and Met129 sites. Graphics were produced using CCP4mg (McNicholas et al., 2011  ). |
![[Figure 2]](ap5033fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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