RT Journal Article SR Electronic T1 Partial deletion of 4p and 4q in a fetus with ring chromosome 4: phenotype and molecular mapping of the breakpoints JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP e23 OP e23 DO 10.1136/jmg.39.5.e23 VO 39 IS 5 A1 A Kocks A1 S Endele A1 R Heller A1 B Schröder A1 H-J Schäfer A1 C Städtler A1 M Makrigeorgi-Butera A1 A Winterpacht YR 2002 UL http://jmg.bmj.com/content/39/5/e23.abstract AB