Ratio of TNR sequence frequencies to genomic background. Differences shown are the log-ratio of the frequency of TNRs with the specific sequences identified vs. whole-genome order-two Markov backgrounds. TNR sequence frequencies vary markedly across different organisms. In all organisms, TNR sequence distribution was very different from the background, and organisms also have very different distributions from one another.
Willadsen et al. BMC Genomics 2013 14:76 doi:10.1186/1471-2164-14-76