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GUS activity in extracts of leaves from transgenic tobacco plants carrying the P-E∷GUS gene, P-E∷GUS/P-35S∷RF2a, P-FL∷GUS, or P-FL∷GUS/P35S∷RF2a. The amount of GUS (pmol MUG min−1 mg−1 protein) is indicated. The mean level of GUS activity for each construct is indicated by the thick, horizontal bar.
