Hi All,

When I tried BSgenome package for Hsapiens I got the output below. I wonder
what are chromosomes other than chr1-chr22,chrX,Y and M.
What is chr4_gl000193_random for instance.

Thank you
#=========

Hsapiens
Human genome
|
| organism: Homo sapiens (Human)
| provider: UCSC
| provider version: hg19
| release date: Feb. 2009
| release name: Genome Reference Consortium GRCh37
|
| single sequences (see '?seqnames'):
|   chr1                   chr2                   chr3
chr4                   chr5
|   chr6                   chr7                   chr8
chr9                   chr10
|   chr11                  chr12                  chr13
 chr14                  chr15
|   chr16                  chr17                  chr18
 chr19                  chr20
|   chr21                  chr22                  chrX
chrY                   chrM
|   chr1_gl000191_random   chr1_gl000192_random   chr4_ctg9_hap1
chr4_gl000193_random   chr4_gl000194_random
|   chr6_apd_hap1          chr6_cox_hap2          chr6_dbb_hap3
 chr6_mann_hap4         chr6_mcf_hap5
|   chr6_qbl_hap6          chr6_ssto_hap7         chr7_gl000195_random
chr8_gl000196_random   chr8_gl000197_random
|   chr9_gl000198_random   chr9_gl000199_random   chr9_gl000200_random
chr9_gl000201_random   chr11_gl000202_random
|   chr17_ctg5_hap1        chr17_gl000203_random  chr17_gl000204_random
 chr17_gl000205_random  chr17_gl000206_random
|   chr18_gl000207_random  chr19_gl000208_random  chr19_gl000209_random
 chr21_gl000210_random  chrUn_gl000211
|   chrUn_gl000212         chrUn_gl000213         chrUn_gl000214
chrUn_gl000215         chrUn_gl000216
|   chrUn_gl000217         chrUn_gl000218         chrUn_gl000219
chrUn_gl000220         chrUn_gl000221
|   chrUn_gl000222         chrUn_gl000223         chrUn_gl000224
chrUn_gl000225         chrUn_gl000226
|   chrUn_gl000227         chrUn_gl000228         chrUn_gl000229
chrUn_gl000230         chrUn_gl000231
|   chrUn_gl000232         chrUn_gl000233         chrUn_gl000234
chrUn_gl000235         chrUn_gl000236
|   chrUn_gl000237         chrUn_gl000238         chrUn_gl000239
chrUn_gl000240         chrUn_gl000241
|   chrUn_gl000242         chrUn_gl000243         chrUn_gl000244
chrUn_gl000245         chrUn_gl000246
|   chrUn_gl000247         chrUn_gl000248         chrUn_gl000249
|
| multiple sequences (see '?mseqnames'):
|   upstream1000  upstream2000  upstream5000
|
| (use the '$' or '[[' operator to access a given sequence)

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