Applied Biosystems has made available software to view the 150,000 SNP assays from its completed genome-wide human SNP map. The free SNPbrowser software, which can be downloaded here http://www.allsnps.com/snpbrowser, also comprises links to TaqMan Assays-on-Demand products. ABI said the software enables researchers to query the physical location of SNPs on the chromosome and linkage disequilibrium maps, and view the boundaries of putative haplotype blocks.