I've gone through a number of notes and other sources and I don't have anything more to contribute than what I sent
you. I presume the labels on my own cultures would have had some further distinctions but I don't have those.
There is an outside chance that "K-12" acquisitions were given distinctive W-strain numbers but if so I haven't
F. Orskov in Copenhagen may have more old strains; and perhaps Charlie Yanofsky at Stanford can trace Clifton's cultures.
Strains in the 58- and 679- auxotrophic series would have been subcloned out of Clifton's K12 by Ed Tatum in 1944.
As you know my active involvement with K-12 cultures ended roughly 1959. until restarted in 1990.
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As I go through my notes I am reminded that I had very little occasion to use "K-12" per se. Almost all our experiments
used auxotrophs in Ed Tatum's 58- and 679- lineage.
Exception: W1244 is a "K-12" selected for azide-resistance 11/10/49.
That date would precede the imports mentioned by Larry Morse. Do you have it?
W1485 equals "K12" lambda-sensitive. but that's later. October 1950.