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Field trials constitute the indispensable test for genetically improved trees. Transgenic aspen lines were obtained having improved growth, or wood density or with altered wood chemical traits, as determined in previous greenhouse experiments. The selected lines were planted in field trials along with wildtype plants and tested for 5-years for growth and various biotic and abiotic damages. The trial was harvested, and the wood from this trial is being characterized. MSc project on this material is available. The work may include various types of cell wall analyses, TGA analysis, univariate and multivariate statistical analyses, gene expression analyses.