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Alkalinization of the medium around etiolated hypocotyls. (A) On control medium, (B) of fer-4 on metal ions and (C) of loss- and gain-of-function alleles of THE1 on elevated Ni concentrations. (D) BCP is yellow below pH < 5.2 and purple above pH > 6.0. The contrast and brightness of the pictures were increased by 50% and 20%, respectively, except for fer-4 on Pb where only the contrast was raised to +50%.
