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![[Figure 2]](https://journals.iucr.org/ba5143fig2mag.jpg)
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| Figure 2 Since most main-chain amide N—H groups take part in hydrogen bonds, the density at a point found by extrapolating the N—H vector to 2.9 Å from the N atom provides an indication as to whether the amide has been positioned correctly. |
![[Figure 2]](https://journals.iucr.org/10.1107/S0907444909038360/ba5143fig2.jpg)
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STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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