RT Journal Article SR Electronic T1 Human Genetics (Outline Studies in Biology) JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 78 OP 79 DO 10.1136/jmg.17.1.78 VO 17 IS 1 A1 A W Johnston YR 1980 UL http://jmg.bmj.com/content/17/1/78.abstract AB