Esther M. Zimmer Lederberg to François Jacob
Maleness Transferred by Infection at High Frequency
January 12, 1961

Joshua Lederberg is well-known for his work in discovering microbial sexuality (Nobel Prize, 1958). However, Esther Lederberg discovered and named the Fertility Factor "F", by which microbial sexual differentiation (maleness) may be conferred via phage infection, as stated in the letter below.

d0087 EML to FJascob (24-2B, DKaiser&JuliusAdler, transfer maleness at high frequency, Gal-LP82) 1-12-61 59-61

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