[BiO BB] RefSeq Accession Numbers

[hamid]

Hi buddy,
Does any body know, how can I retrieve SwissProt Accession number using the 
protein RefSeq accession number? It seems there is not any cross reference 
between thses two databases!
Yours,
Behnam

/*
 Hamid Nikbakht,
 M.Sc of Cell and Molecular Biology,
 Laboratory of Biophysics and Molecular Biology,
 Bioinformatics Center,
 Institute of Biochemistry and Biophysics(IBB),
 University of Tehran,
 Tehran,Iran.
 Tel: +98-21-6111-3322
 Fax: +98-21-6640-4680
 Alt. E-mail: nikbakht at ibb.ut.ac.ir
*/