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Frequency of palindromes throughout a diverse selection of genomes. Palindrome frequency is expressed as the ratio (R) of occurrence to expectancy. Palindromes are underrepresented (R < 1, dotted line) in all kinds of genomes, most strongly in vertebrates, plants, and viruses, and they exhibit about twice the inter-species variance in frequency (error bars) than non-palindromes. Twenty different genomes were analysed per group (see Section 2).
