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. 2018 Mar 16;9:152. doi: 10.3389/fphar.2018.00152

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Copyright © 2018 Pietrangelo, Di Filippo, Locatelli, Piacenza, Farina, Pavoni, Di Donato, Innosa, Provinciali and Fulle.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Calibration curves. Calibration curves obtained for the four guanosine-based analytes. The graph shows the concentrations of guanosine-based molecules and the relative peak area measured on the developed HPLC procedure.