一般写法是这样: dbSNP后面跟featureID. featureID一般是rs/ss后跟7-8位数字， 比如:
rs12345678或者dbSNP|rs12345678
以下是老鼠(Mus muculas)的1号染色体上SNP列表格式(部分)：
------------------------------------------------------------------------
#taxid chromosome chrStart chrEnd orientation contig cnt_start cnt_stop cnt_orient featureName featureId featureType groupLabel weight
10090 1 3007431 3007431 + NT_039169.2 7431 7431 + rs6357429 dbSNP:6357429 SNP C57BL/6J 3
10090 1 3063273 3063273 + NT_039169.2 63273 63273 + rs6351828 dbSNP:6351828 SNP C57BL/6J 3
10090 1 3063445 3063445 + NT_039169.2 63445 63445 + rs6365082 dbSNP:6365082 SNP C57BL/6J 3
10090 1 3064055 3064055 + NT_039169.2 64055 64055 + rs6368438 dbSNP:6368438 SNP C57BL/6J 3
……
--------------------------------------------------------------------------
说明：第一个SNP的位置是3007431 - 3007431(也就是只有一个位点)。featureName是rs6357429，featureID是6357429，写作 dbSNP:6357429.
以下是dbSNP数据库的rs_fasta格式：(以上例中rs6357429为例)：
GACAGTCCCC ATCTTTCCAT CATTCTTCTC AGTTTATTCA TACATGTTTT AATTTCCATA GTTTTATTAT GTTCCTTTGG
GCTTTTTTTC TGCCCCCCCC CCTTTTTGTG CCTTGTGATT CTTTTTAAGA CTTGTTTATT TGAGAATAGA TAAGCAGGGA
CTACTTGTGA GCAAAGGCTT TCCCAAGTCA AGCCTACTGG AGGTTCTAGG ATCCATCACT CTAGCCTTTC CTGAGGATTA
GGCTTTTCCC
R
GAGTTGAGTG TAACTTTTTC CATCAGTTTT AATACATTAA GCAGCTTATC TCTGCTTCAT TTTAGAAACC TGTAATCTGT
TGCTTTGCCT GCTGTCTGCC CGAGGAACTA CAATTCTAAC ATGCTGTGTT CCTAGTGTAT ATTCTCAGCG GCTTCCAGAC
AAAGCTGCTT GTTCCATCAG CAGTGCATCC AGTACCTGTT GGTGGTCTAT TAGTAGTCCA CATCAGGTGA GACAGATGGA
GTCCTTCTGG
说明：
gnl: object-type=general
dbSNP: Database name
rs6357429: dbSNP rs# or ss#
allelePos=251: Offset of SNP in sequence
totallen=501: Total length of sequence
taxid=10090: taxID
snpClass=1: 1:insertion/deletion 2:microsatellite 4:unclassified heterozygous 3:named without allele sequence 5:or no variation 6:.
alleles='A/G': List of alleles
rs_fasta格式详细说明请看：
ftp://ftp.ncbi.nih.gov/snp/00readme.txt
