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Contribution of external Ca2+ to the protoplast swelling responses induced by IAA, NAA, and D16 antibodies. Experiments were conducted as described for Figure 6 using a Ca2+-free medium and including the resuspension in the standard medium. Protoplasts were treated at vertical dashed lines with IAA (A and B), NAA (C), or D16 antibodies (D) at the concentration indicated in blankets. The means obtained from 17 to 30 protoplasts (two experiments) are shown.
