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Measurement of cell death by Evans blue uptake in M. truncatula root apices. Relative Evans blue uptake (OD600 for Al treated root tips/OD600 for control (-Al) root tips) in root tips of M. truncatula lines T32 and S70 grown in 0 μM and 2.5 μM Al solutions for 12, 24, 48 and 72 h.
