Small nucleolar RNAs (snoRNAs) are among the most evolutionarily ancient classes of small RNA. Two experimental screens published in BMC Genomics expand the eukaryotic snoRNA catalog, but many more snoRNAs remain to be found. See research articles http://www.biomedcentral.com/1471-2164/10/515 and http://www.biomedcentral.com/1471-2164/11/61 .
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Gardner et al. (2010) studied this question.