Mental retardation in a child with a long B-group chromosome.
D002648:Child; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002905:Chromosomes, Human, 4-5; D003878:Dermatoglyphics; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male