Figure 1From: Practice guidelines for the molecular analysis of Prader-Willi and Angelman syndromes Genes within the PWS and AS critical region. Blue boxes represent paternally expressed genes; blue vertical lines, snoRNAs; red boxes, maternally expressed genes; black boxes, biallelically expressed genes and arrow heads represent the orientation of transcription. IC, imprinting centre; BP, common breakpoint cluster region.Back to article page