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Proposed model for the function of identified ACEX factors in regulating CBF2 expression and Arabidopsis tolerance to abiotic stresses. Gene products defined by the selected acex mutants are shown to positively (arrowheads) or negatively (end lines) regulate the expression of CBF genes in response to low temperature as well as the tolerance of Arabidopsis to freezing, before and after cold acclimation, dehydration, and high salt.
