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Activation of the phas promoter requires both PvALF and ABA. Expression is shown as MUG activity in leaves of isogenic lines 58.1A (-1470phas/uidA) and PvAlf-14 (-1470phas/uidA; CaMV35S/PvAlf). Leaves were cultured in MS solution containing the indicated concentrations of ABA. The results are the average of at least five replicates.
