Fig. 1.

Stereoview of the crystal structure of 4C6 Fab, with the C^α trace of the light (L) and heavy (H) chains colored in light and dark gray, respectively. The modified tryptophan Trp^L163 is highlighted in red, and other tryptophan residues (such as Trp^H97) are colored green. The modified glutamine residue Gln^H6 is also colored red. All of the figures were generated in bobscript (12) and rendered in raster3d (13).