GRCm37_UCSC2gencode.txt

chr1	chr1
chr10	chr10
chr11	chr11
chr12	chr12
chr13	chr13
chr13_random	
chr14	chr14
chr15	chr15
chr16	chr16
chr16_random	NT_166325
chr17	chr17
chr17_random	
chr18	chr18
chr19	chr19
chr1_random	
chr2	chr2
chr3	chr3
chr3_random	NT_166286
chr4	chr4
chr4_random	
chr5	chr5
chr5_random	
chr6	chr6
chr7	chr7
chr7_random	
chr8	chr8
chr8_random	
chr9	chr9
chr9_random	
chrM	chrM
chrUn_random	
chrX	chrX
chrX_random	
chrY	chrY
chrY_random