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IAA synthesis from [15N1]Trp (A) and 2H2O (B). Relative incorporation of 15N1 and 2H are expressed as the ratios of m/z 203/202 and (203 + 204)/202, respectively. Incubation initiated at d 1 (▴), d 4 (●), and d 7 (▪). Vertical bars represent sd.
