Question: suppose you have a completely unknown protein, that you don't know anything about. How do you colour all non-amino-acid atoms salmon-pink?? In O, this is easy! First you create a residue property table, giving all amino acids a character property, for example AA. Then you read the residue table into the database using the Db_table_residue command. Finally, you go
obj salmon paint_property residue_amino_acid != AA salmon paint_property residue_amino_acid = AA green zone ; end
Easy, huh?