做SNP genotyping应该常看的几个database：

1. NCBI dbSNP

从这里出发可以连到下面几个网站。

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=snp

2. International HapMap Project

The International HapMap Project is a partnership of scientists and funding agencies from Canada, China, Japan, Nigeria, the United Kingdom and the United States to develop a public resource that will help researchers find genes associated with human disease and response to pharmaceuticals.

http://www.hapmap.org/

3. UC Santa Cruz Genome Assembly

http://genome.ucsc.edu/index.html?org=Human

4. Ensembl （举个例子）

http://www.ensembl.org/Homo_sapiens/snpview?snp=rs2077647&source=dbSNP