Retrieved April 9, 2011. "Obama's remarks on signing the stimulus prepare". Dyer, James (April 10, 2013). "Interstellar". As in prokaryotes, there is a incredibly substantial proportion of coding DNA and an absence of repeats. Mitochondrial tRNA genes have different sequences from the nuclear tRNAs, but lookalikes of mitochondrial tRNAs have been located in the nuclear chromosomes with significant sequence similarity.