Questions regarding a particular paper With respect to the following paper: Automated identification of protein-ligand interaction features using Inductive Logic Programming: a hexose binding case study I have a few questions: 1. in page 2, in the table, what does 501 mean in GLC-501(I searched for GLC-501 in PDB,couldnt find anything) 2. in page 3, in the table, the cavity center column has got two entries, what does that mean? does one entry belong to the protein and another entry to the ligand(left for protein and right for ligand)??

1. 501 denotes 501st residue in the corresponding PDB entry — 1BDG. See here

2. A single protein can have multiple cavities (see here) and the multiple entries denote centres of different cavities.