bookmark G4LDB / G-quadruplex ligands database A comprehensive and well-organized database of G-quadruplex ligands. G-quadruplexes are guanine-rich nucleic acid sequences in human telomeres and gene promoter regions. G4LDB currently contains >800 G-quadruplex ligands with 4000 activity records. It offers a user friendly interface that can meet a variety of data inquiries from researchers. For example, ligands can be searched for by name, molecular properties, structures, ligand activities and so on.