Supplementary material for Farver et al. (1999) Proc. Natl. Acad. Sci. USA 96(3), 899-902.

Fig. 4.

Comparison of the proposed electron transfer pathways in the blue copper (thin line) and purple Cu_A (thick line) azurins. The rms derivation is 0.24 Å when all of the atoms along the pathways are considered.