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Fig. S1 Chromatograms showing lack of methylated arsenic (As) species in axenically grown plant extracts.

Fig. S2 Arsenic speciation in rice shoots and roots exposed to arsenate or arsenite in axenic culture.

Fig. S3 Arsenic speciation in different rice cultivars exposed to arsenate in axenic culture.

Fig. S4 Arsenic speciation in pore water of UK arable soil incubated under flooded conditions without plants.

Fig. S5 Detection of methylated As in nutrient solution amended with arsenite.

Table S1 Recovery and speciation of the certified reference material NIST 1568a rice flour

Table S2 Relative abundance of arsenic methyltransferase gene (arsM) sequences detected in a Bangladeshi paddy soil using GeoChip 4.0

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