Our complete SNP database is available for download from our web site at http://zork.wustl.edu/nida/neurosnp.html, and the top 5,000 SNPs ranked by GIN prioritization score [4] is provided in a spreadsheet as supporting file S2. The entire database includes all SNPs from dbSNP build 128, and is annotated with allele frequency data from the four HapMap samples; there is no restriction on the allele frequency in the database. There are also flags indicating whether a SNP is on a particular custom microarray specifically designed by Hodgkinson and colleagues to target alcoholism and other addiction related phenotypes [16], or was part of an addiction study by Nielsen and colleagues [17].