Smith A, Einfeld S
Hum Genet. 1986 Feb;72(2):188. doi: 10.1007/BF00283946.
An isochromosome of 15(q12) was found in a mentally retarded patient with behaviour disorders which included hyperactivity, short attention span, aggression, and autistic behaviour. There were only minor physical anomalies; he did not have the Prader-Willi syndrome.