Four Distances between Pairs of Amino Acids Provide a Precise Description of their Interaction
Figure 2
Six projections of the four distances connecting Arg and Asp.
The four distances are: NH1–OD1 (d11), NH1–OD2 (d12), NH2–OD1 (d21), and NH2–OD2 (d22). Six projection are needed to plot the four dimensional data. Only cases with correct IUPAC atom name assignment protocol were considered.