you could look into the pdb file to find out what residue number your ligand 
has. but i guess most often proteins and ligands have different chain ids.

On Tuesday 12 July 2005 12:25, Andrea Spitaleri wrote:
> Hi,
> thanks. that was my first answer and it works.
> but in case the chain id are the same?
>
> and
>
> 2005/7/12, Marc Bruning <brun...@mpghdb.desy.de>:
> > in case your ligand has a different chain id than your protein, you could
> > use that to distinguish.
> >
> > On Tuesday 12 July 2005 11:59, Andrea Spitaleri wrote:
> > > Hi all
> > > is there any shortcut to select all aminoacid in a complex and not the
> > > ligand? something like
> > > select my, all and not "ligand" where I don't know the resn of the
> > > ligand but in my script I should be able to discern between aminoacids
> > > (ALA,VAL, etc...) and not.
> > > thanks in advance
> > >
> > > Regards
> > >
> > > andrea
> > >
> > >
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