LL, AUG ยป 3 1962 PHC DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE PUBLIC HEALTH SERVICE . BETHESDA 14, MD. NATIONAL INSTITUTES OF HEALTH OLiver 6-4000 August 21, 1962 Dr. Joshua Lederberg Department of Genetics Stanford University Medical School Palo Alto, California pw thifte Dear Dr. Lederberg: Is it possible to obtain a culture of E. coli K-12 mutant 58-278, the phenylalanine auxotroph? Thank you very much. Sincerely, ROM: jt R. Carl Millican National Cancer Institute National Heart Institute National Institute of Allergy and Infectious Diseases National Institute of Arthritis and Metabolic Discasce National Institute of Dental Research National Institute of Mental Health National Institute of Neurological Diseases and Blindness The Clinical Cemter Division of Biologics Standards Division of General Medical Sciencee Division of Research Grants Division of Research Services