Aligned C-box sequences from different plant and animal species. Data were taken from the 5 S rDNA database  or the Genbank: EU816952, GU339175, JF277447, EU257402. Shaded letters indicate conserved nucleotides in plant genera. Cassandra is a non autonomous retroelement homologous to 5 S gene . Variable nucleotides within the unique C*box are in bold underlined. Numbering is according to the Arabidopsis gene. Sequenced Asteraceae genes were reported in [46–48].