Figure 2 - full size

Figure 2. Fig. 2. Antibody-combining site of 34E4 bound to hapten. The heavy and light chains are colored in blue and green, respectively. Two of the active-site water molecules are designated S1 and S21. The 3F[o]-2F[c] [A]-weighted electron density map around the hapten and key active-site residues is contoured at 1.3 . Hydrogen bonds are shown as broken lines. TrpL91 forms a cation- interaction with the guanidinium moiety of the hapten. CDR H3 is omitted for clarity.