A compound of four nucleotides; once thought to represent the actual structure of nucleic acid (tetranucleotide theory). ... (05 Mar 2000) ... 
Type: Term Pronunciation: tet′ră-nū′klē-ō-tīd Definitions: 1. A compound of four nucleotides; previously thought to represent the actual structure of nucleic acid (tetranucleotide theory).
Tetranucleotide: A sequence of 4 base pairs. (Bases are the building blocks of DNA.) Expansion of a tetranucleotide repeat (CCTG) in the ZNF9 gene causes type 2 myotonic dystrophy.