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Ses. Based on these criteria, 30 proteins were considered to be robustly identified from mucilage, all containing predicted signal peptides (Supplemental Data Set S3). Cruciferin A1 and cruciferin C were discarded from further analyses, since they are not known to be secreted to the apoplast. This leaves a total 28 potential mucilage proteinsPlant Physiol. Vol. 173,identified (Table I; Supplementa