ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,741,983, issued on Sept. 22, was assigned to RIKEN GENESIS Co. LTD. (Tokyo).

"Artificial nucleic acid, method for producing same, and use thereof" was invented by Haruhisa Yoshikawa (Tokyo), Ikuya Ban (Tokyo) and Takeshi Imanishi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a compound represented by formula (1) or a salt thereof wherein: "Base" represents an aromatic heterocyclic group which may have a substituent, or an aromatic hydrocarbon ring group which may have a substituent; A1 represents a single bond or an alkylene group; R1 to R5 represent an atom or a group disclosed in the specification."

The patent was filed on March...