| 
  | get_active_site_asl(base_asl,
        lig_asl,
        cutoff=6.0,
        fillres=True)
   |  |  Returns an ASL expression defining binding site atoms based on the 
  ligand molecule number and cutoff distance. This ASL specifically 
  identifies the C-alpha atoms. 
    Parameters:
        cutoff(float) - Cutoff from ligand used to asign binding site atomsmolnum(int) - The molecule number fo the ligand. If None the ligand will be 
          automatically detected.fillres(bool) - Use all atoms in a residue if any atom is foundReturns: strASL expression for binding site atoms |