RT Journal Article SR Electronic T1 49,XXXXY chromossomal anomaly in a neonate. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 220 OP 221 DO 10.1136/jmg.8.2.220 VO 8 IS 2 A1 A Hayek A1 V Riccardi A1 L Atkins A1 H Hendren YR 1971 UL http://jmg.bmj.com/content/8/2/220.abstract AB