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Age-dependent changes in isoprene emission rate, apparent DMADP pool size and the apparent rate constant of isoprene synthase (a), and the apparent rate constant of isoprene synthase in relation to apparent DMADP pool size (b) in different-aged aspen leaves. Figure S1.1 demonstrates determinations of the apparent DMADP pool size and the rate constant of isoprene synthase (Supplemental Material S1). Data are means ± SE of at least four replicate measurements.
