According to a marketing newsletter I don't now have at hand, Clontech
sells Tet-free serum. I don't have a catalog number since it
is (I guess) a relatively recent line addition and not in the usual
catalog. Their phone number is: (415) 424-8222 or (800) 662-CLON.
I have no connection to this company other than as an occasional customer.
Bob Cowherd
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