Karyotype studies among children with severe visual handicap.

Fronm the Godfrey Robinson Unit (Royal National Institute for the Blind),' Department of Research in Ophthalmology, Royal College of Surgeons, London; the Galton Laboratory,2 University College, London; the Institute ofChild Health,3 Children's Hospital, Birmingham; the Department ofAnatomy,4 St. Thomas' Hospital Medical School; and the Paediatric Research Unit,5 Guy's Hospital Medical School, London

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[6]  E. Hadorn.  Letalfaktoren in ihrer Bedeutung für Erbpathologie und Genphysiologie der Entwicklung , 1955 .