Additional file 6.
Nearly all examples of independent transcription of snoRNA genes in Li et al.  are erroneous. Screenshots of UCSC Genome Browser (March 2006, NCBI Build 36.1) and nucleotide sequence alignments of snoRNA genes and pseudogenes are shown. The antisense elements are boxed; H, ACA, C, and D/D' sequences are underlined. The nucleotides whose modification is guided by snoRNA are indicated in some cases. SnoRNA genes and pseudogenes (designated as pseudo or Ψ) are listed in the same order as in Tables three, four, and five of Li et al. . The secondary structures were predicted by mfold [42,43].
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Makarova and Kramerov BMC Genomics 2011 12:543 doi:10.1186/1471-2164-12-543