RT Journal Article SR Electronic T1 Comments on important genetic topics from papers in other journals JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 139 OP 139 DO 10.1136/jmg.29.2.139-c VO 29 IS 2 A1 John C K Barber YR 1992 UL http://jmg.bmj.com/content/29/2/139.4.abstract AB