Hi Spencer,

multi-letter chain IDs of arbitrary length will be available in the next PyMOL 
version. It's in fact already available with the latest updates in our 
open-source SVN repository on sourceforge.

Cheers,
  Thomas

On 17 Sep 2014, at 06:36, Spencer Bliven <sbli...@ucsd.edu> wrote:

> Are there plans to support 4-letter chain IDs, as defined by the current 
> xPDB/mmCIF specification? 
> 
> -Spencer
> 
> On Tue, Sep 16, 2014 at 3:36 PM, Thomas Holder 
> <thomas.hol...@schrodinger.com> wrote:
> Hi Folmer and Yeping,
> 
> to support upper and lower case letters, set this setting:
> 
> PyMOL> set ignore_case, off
> 
> Cheers,
>   Thomas
> 
> On 16 Sep 2014, at 02:44, Folmer Fredslund <folm...@gmail.com> wrote:
> > Hi Yeping Sun,
> >
> > Did you solve your problem?
> >
> > According to http://www.wwpdb.org/procedure.html#toc_4
> > "
> > What is the maximum number of chain IDs in a file?
> >
> > Up to 62 chains can be included in the PDB entry. Upper case letters and 
> > numbers (0-9) should be used first for chain IDs. Lower case letters should 
> > be used only after all upper letters and numbers have been used. Symbols 
> > should never be used for chain IDs."
> >
> > you can use numbers and also small letters in the PDB file format.
> >
> >
> >
> > I don't know if PyMOL will let you do this, though.
> >
> > Regards,
> >
> > Folmer
> >
> >
> > 2014-09-02 10:41 GMT+02:00 sunyeping <sunyep...@aliyun.com>:
> > I have a protein which contains 32 chains. By using A-Z can only name 26 
> > chains. Can I use expression containing two character such as A1, AB, etc. 
> > to as chain id? Will this change the format of the pdb files?
> >
> > Yeping Sun
> >
> > Institute of Microbiology, Chinese Academy of Sciences
> >
> > --
> > Folmer Fredslund
> 
> --
> Thomas Holder
> PyMOL Developer
> Schrödinger, Inc.

-- 
Thomas Holder
PyMOL Developer
Schrödinger, Inc.


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