Nunzio, make sure that either the DNA is present with ATOM records instead of HETATM records or set "surface_mode" to 1. HTH Carsten
-----Original Message----- From: Nunzio Iraci [mailto:nunzio.ir...@gmail.com] Sent: Saturday, February 28, 2009 7:28 AM To: pymol-users@lists.sourceforge.net Subject: [PyMOL] dna surface hi, do you have any idea of how to represent a dna by its surface? thanks Nunzio