How come SNPlocs-style "ch21" seqnames aren't in seqnames.db?

R> supportedSeqnameMappings()$Homo_sapiens
data frame with 25 rows and 2 columns
           NCBI        UCSC
    <character> <character>
1             1        chr1
2             2        chr2
3             3        chr3
4             4        chr4
5             5        chr5
...         ...         ...
21           21       chr21
22           22       chr22
23            X        chrX
24            Y        chrY
25           MT        chrM

R> packageVersion('seqnames.db')
[1] '1.0.1'



-- 
*A model is a lie that helps you see the truth.*
*
*
Howard Skipper<http://cancerres.aacrjournals.org/content/31/9/1173.full.pdf>

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