Figure 4 - full size

 

Figure 4.
Figure 4. Helix Structure and Sequence Alignment of HPt DomainsSide-view of helix D of the HPt domain of ArcB using a ball-and-stick model with the 2F[o]-F[c] electron density map. The imidazole ring makes a hydrogen bond to a water molecule (W).

The above figure is reprinted by permission from Cell Press: Cell (1997, 88, 717-723) copyright 1997.