Her new findings show that other triggers, including oxygen and a substance similar to Vitamin C, can also trigger DNA to change its shape.
The team added copper salts to DNA in oxygen free conditions in order to change its shape to an i-motif. By exposing the i-motif to oxygen in the air, it then changed from in i-motif into a hairpin.
The shape can then be changed from a hairpin back to an i-motif by adding sodium ascorbate, which is similar to vitamin C, and back to an unfolded state using a chelating agent
For new readers, Sodium Ascorbate is not "similar" to vitamin C - it is a form of vitamin C. (Vitamin C is actually the "ascorbate" fraction or ion. See https://www.vitamincfoundation.org/basics.php for more info.).