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Shoot apical meristem proliferation of untreated mp nph4 MP-GR seedlings. (A and C) Lateral and (B and D) apical views of mp nph4 MP-GR seedlings. Leaves are absent at 17 d after germination (DAG) (A and B) while lateral outgrowths become apparent by 24 DAG (C and D). (E-G) Prolonged growth of the shoot apical meristem (140 DAG) results in the proliferation of disorganized structures that bear little resemblance to normal plant organs. Bars: 200 μm.
