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Intron-exon structure for NP-like genes in Populus trichocarpa. A comparison of gene structure was constructed using the primary NP-like transcripts from Phytozome (http://www.phytozome.net) and the gene structure draw server found at the PIECE database (http://wheat.pw.usda.gov/piece/index.php). NP-like gene subfamilies are indicated by brackets.
