S | Department of HEALTH, EDUCATION, AND WELFARE + Public Health Service National Institutes of Health * Bethesda 14, Md. NATIONAL INSTITUTE OF ARTHRITIS AND METABOLIC DISEASES NATIONAL CANCER INSTITUTE NATIONAL INSTITUTE OF DENTAL RESEARCH July 12 ’ 19 oS NATIONAL HEART INSTITUTE NATIONAL, INSTITUTE OF MENTAL HEALTH NATIONAL MICROBIOLOGICAL INSTITUTE NATIONAL INSTITUTE OF NEUROLOGICAL DISEASES AND BLINDNESS ‘THE CLINICAL CENTER DIVISION OF RESEARCH GRANTS Dr. Joshua Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Dr. Lederberg: Can you tell me of any published work dealing with genetic recombination in meningococci? I have known of several persons who have attempted such a study but none who stayed with it very long. I am preparing a brief review of some of the recent work on the meningococcus, and would like to make it up to date as well as correct. If you know of any such work I shall indeed appreciate knowing of it. It is a fascinating field to me. Sincerely yours Sane 5? i Sara &. Branham, M.D. Division of Biologics Standards 12 dre Bor SUh ts