1. "cystine" (2 cys residues that are disulfide bonded) appears to be 
undefined as a selection term. This may be an oversight since it was 
defined in Chime. Currently I can select cystine this way:

select cys.sg and connected(cys.sg)
select within(group, selected)
define ~cystine selected

but I think this is a bit tricky -- it would be more convenient if 
"select cystine" worked, and simpler for novices. Then non-disulfide 
bonded cys residues can be selected as

select cys and not ~cystine

2. What is the easiest way to select all interchain (or intrachain) cystines?

The simplest way I can think of is to loop through all chains 
(preferable) or polymers using e.g. for chain A

select cys:a.sg and connected(cys:a.sg)

This selects all intrachain cystines in chain A.

But I don't know how to set up a "for" loop that loops through each 
named chain. Can someone tell me how? Or suggest an easier method?

Thanks, -Eric


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