Primers (probes) are analyzed for all primer secondary structures including G-quadruplexes detection (Hoogsteen base pairs), hairpins, self-dimers and cross-dimers in primer pairs.
G-quadruplex, the four-stranded nucleic acid structure that is, among scientists, sometimes referred to as a quadruplex.
This collation, reproduced by Bianchini in his "Evangelium Quadruplex", was considered faulty; a correction of it is in the first volume of Wordsworth and White, "Old Latin Biblical Texts".
Quadruplex telegraph, an improvement on the electrical telegraph patented in 1874 by Thomas Edison