RT Journal Article SR Electronic T1 A T to C mutation in the polypyrimidine tract of the exon 9 splicing site of the RB1 gene responsible for low penetrance hereditary retinoblastoma JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP e21 OP e21 DO 10.1136/jmg.39.5.e21 VO 39 IS 5 A1 S H Lefévre A1 L Chauveinc A1 D Stoppa-Lyonnet A1 J Michon A1 L Lumbroso A1 P Berthet A1 D Frappaz A1 B Dutrillaux A1 S Chevillard A1 B Malfoy YR 2002 UL http://jmg.bmj.com/content/39/5/e21.abstract AB