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A study in primates demonstrated that the SNAR-C4 is a small non-coding RNA expressed in human testis and at low levels in the adult brain, and it co-immunoprecipitates with the NF90b protein [Parrott et al. DOI:10.1093/nar/gkq856]. This RNA is a member of the snaR family, which evolved exclusively in African Great Apes through segmental duplication from retrotransposon ancestors, and its expression is restricted to specific tissues [Parrott et al. DOI:10.4161/mge.18478].