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Roots of cowpea grown in 4 µm As(III) or 4 µm As(V) for 24 h and examined using µ-XRF. Brighter colors correspond to higher As concentrations (see color scale in Fig. 2). There are two replicate roots for each treatment. Note that the root cap and mucigel are difficult to see in roots exposed to As(III) due to the low As concentrations within these tissues.
