Emerging roles of non-coding RNAs in gastric cancer: Pathogenesis and clinical implications

Figure 2 Categories of lncRNAs. lncRNAs are usually classified into five categories: (1) sense; or (2) antisense, when overlapping one or more exons of another transcript on the same, or opposite strand; (3) bidirectional, when the expression of lncRNA and a neighboring coding transcript on the opposite strand is initiated in close genomic proximity; (4) intronic, when lncRNA is derived wholly from within an intron; and (5) intergenic, when lncRNA lies within the genomic interval between two genes.