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. 2018 Dec 5;9:710. doi: 10.3389/fendo.2018.00710

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Copyright © 2018 Mäkelä, Karhu, Jurado Acosta, Vakkuri, Leppäluoto and Herzig.

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(s) 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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The figure depicts OXA concentrations in HPLC fractions of 4 ml human plasma extracted with Sep-Pak C₁₈ Cartridges. Elution from 0 to 60% of acetonitrile in 0.1% trifluoroacetic acid is shown by a dotted line with flow-rate 1 ml/min. Only fraction number 26 contained (1 min fraction) 17 pg immunoreactive OXA (right vertical axis is added to show the pg/fraction and a black bar to indicate the amount of OXA).