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Fluorescence In Situ Hybridization
Polymerase Chain Reaction
Karyotyping
Pedigree
Chromosomes, Human, Pair 15
Chromosomes, Human, Pair 22
Chromosome Aberrations
Angelman Syndrome
Prader-Willi Syndrome
Diseases in Twins
Developmental Disabilities
Chromosome Disorders
Fetal Diseases
Mental Retardation
Phenotype
Genetic Heterogeneity
Genomic Imprinting
Cosmids
Multigene Family
Infants
Co-Publications
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