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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Relative expression level of PAL in the stems and leaves under UV-B stress (A,B) and the roots and leaves under high-light stress (C,D) when the most and least stably expressed reference genes were used for normalization.