A mapping of an ensemble of mitochondrial sequences for various organisms into 3D space based on the word composition

► We developed a novel mapping of an ensemble of biological sequences into 3D space. ► Each sequence was represented as a word-composition vector by using the word length of 7. ► We mapped the vectors for the mitochondrial genome sequences for 311 species into a 3D space. ► The properties of the word-composition vectors were quantitatively conserved in 3D space. ► We also discussed the characteristic structures in the 3D map.