Who can help me with Rasmol ? What is the command to oblige the machine to name some groups in a molecule, for example atoms number: 32-33-34-35-38-39-40-41-90-91-92-93-94-95 = residu Asparagine ? That is a new peptid built with another soft and that is a ent file. Thanks. e.mail : avandewiele at nordnet.fr