Quadruplex a. : Fourfold; folded or doubled twice.

Example:
How much training was required to operate and maintain a 'Quadruplex' videotape recorder?

Taxonomy
G-quadruplex, Quadruplex, quadruplexes, telomeric, bind, genes, tetrads, model, free encyclopedia, sequences, DNA, intramolecular, DNA strand, N1, strands, putative, Ligands, in vivo.

Defination from the web:
quadruplex sequence motifs in human DNA, Todd, Johnston, and Neidle, NAR 2005 33(9) 2901-2907. Quadruplex DNA: sequence, topology and structure, Burge, Parkinson, Hazel, Todd and Neidle, NAR 2006 34(19) 5402-5415 ...