SEQtools is a comprehensive free program package for handling and analysis of nucleotide and protein sequences. A large number of improvements has been included in version 8.1.161 of seqtools. Download a free copy at www.seqtools.dk. D.Sci. Soeren W. Rasmussen Valby DataCenter Valbygaardsvej 18 DK-2500 Valby Denmark swr at seqtools.dk www.seqtools.dk