On Wed, 28 Nov 2001, Ng Pei Ling wrote: > find HETATM in my Protein Data Bank file. But, I don't know what is > the meaning of HETATM file. May I know the answer of below question ? http://pdb.ccdc.cam.ac.uk/pdb/docs/format/pdbguide2.2/guide2.2_frame.html Szilva