Release 1.0  July 18, 2001 (First release)  Data from GenBank Rel.123.

Release 1.1 November 29, 2001 (Revised version) Data from GenBank Rel.123.

Release 1.2 December 13, 2001 (Redundancy  removed) Data from GenBank Rel.123.

Release 1.2 June 16, 2003 (Literature added) Data from GenBank Rel.123.