Table 1.

Summary of genetic polymorphism data stored in different sub-databases

Data set name	DB name	No. of accessions	Avg. no. of SNPs per accession
2010	at	249	21 485
384	dbsnp	96	384
Perlegen	chip	20	1 126 230
149SNP	stock	5788	149
250kSNP	stock_250k	199	216 132