1. DBTSS (Database of Transcriptional Start Sites) come from http://dbtss.hgc.jp/.

2. REBASE (The Restriction Enzyme Database) come from http://rebase.neb.com/rebase/rebase.html.

3. CTCFBSDB (CTCF binding site database) come from http://insulatordb.utmem.edu/.

4. NCBI Nucleotide database from http://www.ncbi.nlm.nih.gov/.