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IAA2∷GUS expression is up-regulated in tnp mutant structures. All seedlings are 7 d postgermination. A, IAA2∷GUS expression in wild-type seedlings, 7 d postgermination. B, Weak tnp mutants with IAA2∷GUS expression in structures (arrows), 7 d postgermination. C, Strong tnp mutants showing IAA2∷GUS expression, 7 d postgermination. D, A wild-type (left) and a tnp (right) seedling grown on 10 nm 2,4-D, for 7 d postgermination.
