IGFBP2 and Angelman syndrome: We note that in this less restrictive analysis, the association of the 15q11.2-q12 (Prader-Willi/Angelman syndrome) was driven by the smaller 15q11.2 BP1-BP2 deletion and that no subjects in this study carried a deletion with a >50% overlap with the Prader-Willi/Angelman syndrome critical region.