Fig. 4From: Over-expression of poplar NAC15 gene enhances wood formation in transgenic tobaccoExpression pattern analysis of NAC15 gene. NAC15 gene was most highly expressed in the xylem. Mean values and standard errors were calculated from three technical replicates by 2-△△Ct method with three independent biological replicates. * indicates P < 0.05, ** indicates P < 0.01Back to article page