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Table 5 Background knowledge predicates for the two binding site representations

From: Automated identification of protein-ligand interaction features using Inductive Logic Programming: a hexose binding case study

Representation Background knowledge predicates
atom-only center_coords/2, has_atom/4, dist/4
amino acid has_aminoacid/3, atom_to_center_dist/4,
  atom_to_atom_dist/6, diff_aminoacid/2
  1. The /N indicates the arity of the background knowledge predicate. For instance, given a binding site, the center_coords predicate returns the coordinates of its center (1 input + 1 output arguments = 2).