Hi PyMOL,
 
This may be a very simple problem to solve. How do I select chain-specific individual residues in the command line? For example:
 
1PSO.pdb has two chains: E and I.
If I enter [select catalytic, resi 2] I get the residue I want selected BUT i also get residue 2 in the I chain selected - which I DON'T want to happen.
 
How can i specifiy a chain when selecting a residue in the command line?
 
Thanks,
 
Matthew Jenner - The Sanger Institue