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High Quality Content by WIKIPEDIA articles! Threose nucleic acid (TNA) is a polymer similar to DNA or RNA but differing in the composition of its "backbone". TNA is not known to occur naturally.DNA and RNA have a deoxyribose and ribose sugar backbone, respectively, whereas TNA's backbone is composed of repeating threose units linked by phosphodiester bonds. The threose molecule is easier to assemble than ribose making it a possible precursor to RNA.DNA-TNA hybrid chains have been made in the laboratory using DNA polymerase.TNA can specifically base pair with RNA and DNA; this capability and chemical simplicity suggests that TNA could have preceded RNA as genetic material.