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CDR1 function requires aspartic protease activity. (A) In vitro proteolytic activity assay of E. coli-expressed CDR1. FITC-BSA was used as the substrate, and pepsin was used as a positive control. (B) RT–PCR analysis of PR gene expression in Arabidopsis transformed with CDR1 or various site-directed mutants in which active site or nonactive site aspartate residues are mutated. (C) Influence of pepstatin A on PR gene expression induced by IFs from CDR1 overexpressing Arabidopsis.
