Because docking typically does well at identifying reasonable potential binding modes, but not at correctly recognizing the single most likely binding mode , we chose to manually inspect well scoring poses and select those which seemed most reasonable. Specifically, the top 50 docked poses were visually inspected and poses similar to the reference PDB structures (Table and Fig. ) were selected for the following steps. This step seemed warranted in part because the majority of the top-performing submissions in past D3R grand challenges used visual inspection .