1. Faculty of Medicine, Physiology; University of Helsinki; P.O. Box 63 Helsinki FIN 00014 Finland
2. A.I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio FI-70211 Finland
3. Stem Cell Laboratory for CNS Disease Modeling, Department of Experimental Medical Science; Lund University; BMC A10, Sölvegatan 19 Lund SE-221 84 Sweden
4. Autism Foundation; Kuortaneenkatu 7B Helsinki FI-00520 Finland