August 17, 1956
Dear Dr. Sabin:
In connection with current studies on the formation of protoplasts in Escherichia coli, I can't help but return to the problems of L-forms which have recurred from time to time in this laboratory. I realize that their similarities may be more or less profound, but at least as background, I would like to familiarize myself with pleuropneumonia-like forms.
Have you maintained your collection of these over the years? If so, could I ask you for subcultures of one or two types that might be most favorable for seeing their mode of multiplication? Other things being equal, a saprophytic form that could be grown on non-proteinaceous medium would be preferred.
If you cannot conveniently comply with this request, to whom might you refer me in this country?
In the same connection, I would appreciate any of your publications or reviews on these organisms as may still be available.
With best regards,
Yours sincerely,
Joshua Lederberg