Figure 3From: Practice guidelines for the molecular analysis of Prader-Willi and Angelman syndromes The potential for mis-diagnosis as a result of a Not I restriction site polymorphism in SNRPN exon 1 (i) Genomic organisation. (ii) Southern blot analysis using probe KB17 (lane 1 - PWS; lane 2 - AS; lane 3 - Normal (with Not I polymorphism); lane 4 - Normal).Back to article page