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Figure 1. Types of CpG islands associated with snoRNAs in this study. A, Upstream CpG islands of a snoRNA located within 2 Kb. It includes intergenic independent snoRNAs and snoRNAs within an intron of a host gene. B, 5′-CpG islands of host genes for which RNA processing generates the expression of an intronic resident snoRNA.
