RT Journal Article SR Electronic T1 Progress in Medical Genetics, Volume X JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 432 OP 432 DO 10.1136/jmg.12.4.432 VO 12 IS 4 A1 R. Harris YR 1975 UL http://jmg.bmj.com/content/12/4/432.abstract AB