a. Southern blot of DNA extracted from various glowing transgenic tobacco lines, with the probe annealing to nnluz gene. The results of the blot indicate the presence of two copies of nnluz gene in the genome of the line NT001 (used for all N. tabacum experiments in this study). The Southern blot is from a single experiment performed on DNA samples extracted from five transgenic plant lines and one control line. b. Unprocessed full scan image of the same blot.