In <3ACB0F33.22970.D6CEF5 at localhost>, Viczian Andras wrote: > > >I think the trick is that the SstI is the isoschisomer of SacI not >SacII. > Correct. SacI and SstI are isoschizomers, as are SacII and SstII. Nick -- Nick Theodorakis nicholas_theodorakis at urmc.rochester.edu