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A, 13C incorporation into C2 Ala in maize root tips during hypoxia. Data points are mean values ± se (n = 4). B, Relative contribution of ME and PK to in vivo pyruvate synthesis determined using a steady-state (•) or a nonsteady-state (▴) model (see Methods). Data points are mean values ± ranges, the latter calculated using extreme values from sd values from 13C enrichments.
