Key points are not available for this paper at this time.
Four-fold: Not just the identification, but also the rapid characterization and classification of nucleic acid G-quadruplexes into topology groups is feasible utilizing UV and circular dichroism (CD) spectroscopy (see picture). It is now possible to utilize inexpensive UV spectroscopy to achieve the same level of characterization previously only possible with CD spectroscopy.
Karsisiotis et al. (2011) studied this question.