title: On the origin of the Alu family of repeated sequences.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004330:Drosophila; D005796:Genes; D006801:Humans; D012313:RNA / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D013045:Species Specificity; D014981:Xenopus
chemical_list: D012313:RNA