Table 2.

A catalogue of databases holding information on the structures of known and potential protein targets of the phytochemical constituents of herbs used in TCM.

Database	Content	Source	URL
Therapeutic Target Database (TTD)	Information on 1894 targets, 5028 drugs, diseases, and pathways	Zhu et al. (2010)	http://xin.cz3.nus.edu.sg/group/ttd/ttd.asp
Potential Drug Target Database (PDTD)	Information on 830 targets, protein and active site structures, biological functions, diseases and pathways	Gao et al. (2008)	http://www.dddc.ac.cn/pdtd/
Protein Data Bank	Information of 70,000+ protein structures determined by single crystal X-ray diffraction or high filed 1H NMR studies	Berman et al. (2000)	http://www.rcsb.org/pdb