Heterogeneity via Packing Density

This permits an enhanced tunneling rate estimate based on Eq. (7) 

A histogram of the p for these reaction centers shown in figure 4A shows that p is distributed much as in the presumably arbitrary packing between eofaetors and aromatic amino acids. There is no tendency for productive eharge separation reactions to be accelerated by good packing 

FIGURE 6. Distribution of edge-to-edge distances in the 42 productive reactions between redox centers within oxido-reductases deposited in the PDB. Nearly all the distances are 14 or less. 

---