Sorry - yes thats what I am interested in a bitstring stored in a 
database for every molecule that can be searched first before doing 
substructure searching.

Thanks

 >I think the idea is to have the bit strings precalculated for a set
 >of molecules. Then rather than doing a substructure search over all
 >the molecules, you can do a fast bit comparison, and get a smaller
 >number of molecules to perform the substructure search on.

 >That is the way we do it in our databases here - definitely saves time!


CSL Bioinformatics Internet Pages at http://bioinformatics.csl.gov.uk
----------------------------------------------------------------------
Robert Stones    MRes, BSc              Phone:  +44 (0)1904 462675
Higher Bioinformatics Specialist        GTN:    5129 2675
Central Science Laboratory              Fax:    +44 (0)1904 462111
Sand Hutton                             Email:  [EMAIL PROTECTED]
York YO41 1LZ                           Web:    http://www.csl.gov.uk
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