Research Article Genetics and medicine. 3. Br Med J 1966; 2 doi: https://doi.org/10.1136/bmj.2.5511.453 (Published 20 August 1966) Cite this as: Br Med J 1966;2:453 Article Related content Metrics Responses Peer review This article has a correction. Please see:Royal Free Hospital - September 07, 1901 This is a PDF-only article. The first page of the PDF of this article appears below.