Abstract: A semiconductor device includes a gate electrode disposed within a cell region of a substrate, each of bit line structure pairs including a first bit line structure and a second bit line structure, and extension portion pairs disposed within an interface region of the substrate, each extension portion pair including a first extension portion and a second extension portion that are connected to the first bit line structure and the second bit line structure, respectively. The bit line structure pairs are spaced apart from each other by a first distance. In each bit line structure pair, the first bit line structure and the second bit line structure are spaced apart from each other by the first distance. In each extension portion pair, the first extension portion and the second extension portion are spaced apart from each other at a second distance less than the first distance.

Abstract: This application pertains to a hairpin nucleic acid molecule capable of modulating expression of a target gene and a use thereof. A nucleic acid molecule according to an embodiment can modulate expression of a target gene in a specific manner for cells in which a miRNA hybridizable therewith is present, finding advantageous applications in compositions for regulating expression of a target gene or pharmaceutical compositions for treating diseases.