Bruce Phillips bap at MED.PITT.EDU
Wed Dec 21 13:10:01 EST 1994

	I have kept restriction endonucleases, quite a few in fact, in a
-20C frost-free freezer and they retained good activity for up to 6 years.
Included were SstI, KpnI, EcoR1, XbaI, etc.  The tubes were sealed well.
The high glycerol (and other?) cryoprotective reagents seem to work very
well for these reagents.

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