Hi Helen,
This specifier:

:241.water

should select just water 241.  Another trick you can use is to type a '+' in the command (separated by spaces from the rest of the command) and then control-click on an atom in the residue you want.  The '+' will be replaced by the specifier for that atom, in your case probably something like:

:241.water@O

You would then just delete the "@O" part.

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        http://www.cgl.ucsf.edu

On Mar 31, 2008, at 10:14 AM, hjoseph@brandeis.edu wrote:
Hi Everyone,
           I want to select one water molecule but every time I try to  
do that, all the molecules get selected. Could some one tell me the  
command line instruction for selecting water 241.

  Thanks,
  Helen Josephine

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