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Genes in listings etc. often have a number of the type NC_000012.12 associated with them. How should this be interpreted?

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  • $\begingroup$ I have edited your question so the title is more useful to others, in view of your original misunderstanding and the correct answer supplied by @JITZ. $\endgroup$
    – David
    Apr 6, 2017 at 12:09

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This particular ID represent RefSeq accession number. NC_ stands for a genomic molecule representing complete genomic molecule, usually reference assembly. Every sequence has a stable accession number, a version number, and an integer identifier (gi) assigned to it. RefSeq records can be distinguished from INSDC records by the inclusion of an underscore (“_”) at the third position of the accession number.

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  • $\begingroup$ New sequences are no longer being assigned GI numbers (source) since they were redundant. Use "accession.version" instead, e.g. "NC_000012.12". $\endgroup$
    – mgkrebbs
    Apr 6, 2017 at 20:12

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