snoRNA expansion in vertebrates. The number of snoRNA families (A) and the total number of snoRNA copies (B), based on the genomic organization, were calculated in each of eight vertebrate species. The number of snoRNA families (C) and all snoRNA individuals (D), with single or multiple genomic loci in the eight vertebrate species, are also shown.
Zhang et al. BMC Genomics 2010 11:61 doi:10.1186/1471-2164-11-61