Figure 6 - full size

 

Figure 6.
Figure 6. Water-accessible surface area of NiR-Pa monomer A, slabbed at the level of the d[1] heme. Water molecules are colored in blue, the d[1] heme in red and the phosphate ion in green. The channel starting from the d[1] heme and leading to the `back door' is located between the d[1] heme and the phosphate ion.

The above figure is reprinted by permission from Cell Press: Structure (1997, 5, 1157-1171) copyright 1997.