— Ot EL DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE PUBLIC HEALTH SERVICE BETHESDA 14, MD. NATIONAL INSTITUTES OF HEALTH OLiver 6-4000 December 1L ’ 1961 Dr. Joshua Lederberg Department of Genetics Standford Univ. Med. School Palo Alto, California Dear Dr. Lederberg: Enclosed are two manuscripts of ours which you might be interested in. Both are in press; one in Biochem. Biophys. Res. Comm., and the other in PNAS. I hope to have another manuscript soon which I will send to you. It will contain some characteristics of the genetic code derivable from these and additional data. Sincerely yours, “| wd Sk N meee Marshall W. Nirenberg \ MWN: Lh Encl. National Cancer Inaticute National Heart Inaticute National Institute of Allergy and Infectious Diseases National Institute of Arthritis and Metabolic Diseases Nationa! Institute of Dental Research National Inatitute of Mental Health National Institute of Neurological Diseases and Blindness The Clinical Center Division of Biologics Standards Division of General Medical Sciencer Division of Research Grants Division of Research Services