Changes between Initial Version and Version 1 of Ticket #6067, comment 4


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Timestamp:
Apr 19, 2022, 5:54:57 PM (4 years ago)
Author:
Tom Goddard

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  • Ticket #6067, comment 4

    initial v1  
    1 {{{
    21It can also happen that there are more than one set of symmetry operators which is said to produce chain identifiers like A-3-25.  So they can get longish.  The use the original PDB chain ids as the prefix, so we may also see for a model with chain 1, chain ids like 1-2, 1-3, 1-4, 1-27.  At any rate if you know the tricks still get by in ChimeraX with these files.
    32
    43But some things in addition to hand-type atom-specs are broken.  For instance menu Select / Chains / A-10 does not select anything producing command "select #2/A-10".  And other GUI generated commands are likely to fail unless we spruce up the Python code that produces atom specifier strings so it looks for "-" in chain identifiers.  The mmCIF spec seems to allow not only "-" but also "/", ":", ",", "&", "|", ">", ... basically any punctuation in the chain identifier.  If anyone starts using these in mmCIF files ChimeraX is going to be pretty upset about it.
    54
    6 }}}
     5https://mmcif.wwpdb.org/dictionaries/mmcif_pdbx_v40.dic/Items/_atom_site.label_asym_id.html