RT Journal Article SR Electronic T1 Genetic Engineering 1 JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 159 OP 160 DO 10.1136/jmg.19.2.159-a VO 19 IS 2 A1 Marcus Pembrey YR 1982 UL http://jmg.bmj.com/content/19/2/159.2.abstract AB