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The 5S RNA genes of flax [ Linum usitatissimmn ] are arranged as tandem arrays of a 0.35 – 0.37kb repeating sequence. The 5S DNA is extensively methylated at CCGG and CCGG. In contrast to the rDNA, the 5S DNA sequences exhibit both length and sequence heterogeneity. The number of copies of this sequence varies between 117,000 and 49,600 per 2C nucleus in different lines of flax, and does not correlate with the number of rRNA genes.