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They often undergo extensive posttranslational modifications, such as Pro hydroxylation, glycosylation, and the addition of GPI anchors (Jamet et al., 2008b; Albenne et al., 2013). These modifications not only alter protein mass, thereby complicating protein identification, but they also can anchor the proteins in the apoplast by covalent or noncovalent interactions (Kieliszewski and Lamport, 1994