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Relationship between the ligand size and the size of binding pockets. The size of ligands and pockets is quantified by the number of non-hydrogen atoms. Binding pockets are assigned to four size groups: <100, 100–160, 161–220, and >220 atoms. For each pocket group, quartiles and the interquartile range are calculated for the size of label ligands (blue bars) and those molecules generated by Pocket2Drug (green bars).
