RT Journal Article SR Electronic T1 Parental mosaicism in de novo translocation (21q21q) Down's syndrome. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 502 OP 502 DO 10.1136/jmg.28.7.502 VO 28 IS 7 A1 Croci, G A1 Franchi, F YR 1991 UL http://jmg.bmj.com/content/28/7/502.abstract AB