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Model for the Activation of SNC1 by the snc1 Mutation.
(A) In wild-type plants, SNC1 is sequestered by the proposed negative regulator RBP and is inactive.
(B) In snc1/SNC1 plants, some snc1 protein dissociates from its negative regulator and activates downstream defense pathways.
(C) In heterozygous revertant snc1/− plants, all snc1 protein is sequestered as a result of the excess amount of the negative regulator.
