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Seeds of the cer9 mutants are hypersensitive to ABA over a short development window. A, Seeds on 1/2 MS medium were stratified for 1 d and then transferred to 1/2 MS medium supplemented with 0, 1, or 5 μm ABA. Photographs were taken 6 d after the transfer. B, Seeds on 1/2 MS medium stratified for 2 d were transferred to 1/2 MS medium supplemented with 0, 1, or 5 μm ABA. Photographs were taken 5 d after the transfer.
