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. 2013 Aug 19;13:118. doi: 10.1186/1471-2229-13-118

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Copyright © 2013 Pettengill et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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NP-like family in Populus trichocarpa. (A) Phylogenetic relationship of 13 NP-like proteins in Populus. Numbers at branches indicate posterior probabilities and bootstrap percentages based on 1000 replicates, respectively. Branches in red indicate significant evidence for experiencing episodic diversifying selection based on the branch-site REL test implemented in HyPhy. (B) Heat map representing the relative transcript expression of NP-like genes in shoot tips, young leaves, mature leaves and bark after 8 weeks long-day (LD) conditions and after 3, 6, 8 and 12 weeks short-day (SD) conditions. The 12 week short-day treatment was combined with low-temperature for the final 4 weeks of SD (i.e. after 8 weeks SD). Values were rescaled within each gene between 0 and 1 with 1 indicating highest relative expression levels.