The subset of SNRPN-encoded snoRNAs within this region comprises the PWCR1/HBII-85 cluster of snoRNAs and the single HBII-438A snoRNA.     ///    "Most important, we show that the PWCR1/HBII-85 snoRNAs are not expressed in fibroblasts of this individual. "    ///    Evidence for the role of PWCR1/HBII-85 C/D box small nucleolar RNAs in Prader-Willi syndrome.. 