PPI ：protein-protein interaction
1. DIP (database of interacting proteins)
http://dip.doe-mbi.ucla.edu/dip/Main.cgi 在页面点击
Search by:[protein] [sequence] [motif] [article] [pathBLAST] 选项。如果搜索配体-受体相互作用，进入DLRP。
经实验证实的PPI，高度可信
2. BIND (biomolecular interaction network database)
www.bind.ca，http://bond.unleashedinformatics.com/Action? 需要注册。
3.BioGRID (database of protein and genetic interaction)
http://thebiogrid.org/ 首页可直接search。
4. I2D
http://ophid.utoronto.ca或http://ophid.utoronto.ca/navigator/index.html
有相互作用网络图
