Dear Eric

I though the Calcium vs. Calpha issue was fixed years ago.

> 'select *.cd' selects both carbons delta and cadmium (1d66).

I see, that's because the atom name is shifted by one space and Jmol 
seems not to differentiate
" CD" for delta carbon
"CD " for cadmium
according to PDB spec

Easiest is to use the element in the script:
select *.cd and _C
select *.cd and not _Cd

> 'select *.ca' selects carbons alpha but NOT calcium (4aqr).

select alpha
select *.ca and _C
select *.ca and not _Ca

> What I am using in FirstGlance that fails to select calcium is
> 'select *:A.ca&&hetero'
> (Well, this is not optimal anyway since it would also select alpha carbons in 
> non-standard 
> residues)

Indeed; best use:
select _Ca

> I am now setting about to change my code to
> 'select [ca]:A'
select _Ca and *:A

Hope that helps


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