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Structure-activity relationship of SylA derivatives. A, Structures of SylA derivatives. Differences with the naturally occurring SylA-L-L are indicated with circles and concern double bonds 1 and 2 (red) and stereocenters in Val-1 and Val-2 (green). B, Inhibition of labeling by SylA derivatives. Arabidopsis leaf extracts were preincubated for 30 min with 100 μm SylA derivatives and then labeled for 2 h with 1.6 μm MVB072.
