Nucleotides were extracted using water and hydrochloric acid
following gentrification based on a modified version of the protocol
by Oruña-Concha, Methven, Blumenthal, Young, and Mottram (2007).
Freeze-dried samples (0.3 g) were weighed into 15 mL screw-top
vials; distilled water (5 mL) and hydrochloric acid (5 mL, 0.01 N, HCl)
were added followed by stirring at 90 °C for 90 min. The mixture was
allowed to stand for another 20 min and aliquots of the supernatant
(1.5 mL) were centrifuged at 8500 ×g for 15 min.