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. 2015 Aug 18;6:651. doi: 10.3389/fpls.2015.00651

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Copyright © 2015 Delporte, Legrand, Hilbert and Gagneul.

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) or licensor 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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Ranking of the candidate reference genes for both chicory seedlings and cell cultures according to geNorm. The black line represents the threshold M value of 1.5 above which a putative reference gene is not considered as acceptable.