Amersham sells T7 Gene 6 exonuclease as Cat. No. E 70025Y and Z for 2000 and 10,000 units. Regards, P. Flick -- Parke K. Flick, Ph.D. ch994 at cleveland.freenet.edu Amersham Life Science, Inc. Cleveland, OH 44128 Phone:216-464-9277;FAX:216-360-0975