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
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