Fig. 1From: Convergence in LINE-1 nucleotide variations can benefit redundantly forming triplexes with lncRNA in mammalian X-chromosome inactivationSchematic representation of triple helices. Canonical base triplets formed in pyrimidine and purine triple-helix motifs through Hoogsteen (Left) and reverse Hoogsteen (Right) hydrogen bonding (red dotted lines) are depicted. Parallel and antiparallel triplex formations are shown at the bottomBack to article page