Original Repository: Alan Mason Chesney Medical Archives. Daniel Nathans Collection
Reproduced with permission of Joanne Nathans.
Restriction Enzymes and the "New Genetics," 1970-1980
Letter from David C. Ward to Daniel Nathans (January 13, 1971)
January 25, 1971
I do have some E. coli B restriction enzyme on hand and would be glad to send you some. I don't know the best way to send
it, however. It is kept at 0 degrees and is rather stable under these conditions. I will try adding glycerol and storing it
in dry ice. If the enzyme survives, I shall send some to you this way.