Hi Leila,

"b" is an atom property, so you cannot use it as a selection name.

http://pymolwiki.org/index.php/Property_Selectors#Numeric_Selector_Table

Cheers,
  Thomas

On Thu, Apr 14, 2011 at 4:04 PM, leila karami <karami.lei...@gmail.com> wrote:
> Dear pymol users
>
> My system contains protein (chain a) and dna (chain b).
>
> I did following:
>
> select a, chain a
> select b, chain b
>
> then in b I labeled residues but:
>
> PyMOL>select b, chain b
>  Selector: selection "b" defined with 825 atoms.
> Selector-Error: Misplaced ).
> Selector-Error: Malformed selection.
> ( ( name ca+C1*+C1' and ( byres ( b )<--
>
> how to fix it?
>
> I want to know how label dna residues by command line?
>
> please guide me.
>
> best wishes
>
> --
>
> Leila Karami
> Ph.D. student of Physical Chemistry
> K.N. Toosi University of Technology
> Theoretical Physical Chemistry Group

-- 
Thomas Holder
MPI for Developmental Biology
Spemannstr. 35
D-72076 Tübingen

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