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![[Figure 1]](ba5258fig1mag.jpg)
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Figure 1
Absence of evidence is not evidence of absence. 0.9 Å resolution X-ray structure of a phenylalanine residue in PETN reductase (model and data from PDB entry 1vyr; Barna et al., 2001  ) showing that even though some H atoms can be seen, those that are known to be present are not always observed (at one meta and the para positions in this case). The electron density is calculated excluding H atoms, the pink density is 2Fo − Fc density contoured at 3.0σ and the green density which shows both H atoms at the ortho position but only one at the meta position is Fo − Fc density contoured at 3.0σ. H atoms are shown in green. |
![[Figure 1]](ba5258fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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