a, Genome-wide transcriptomic profiles obtained with Affymetrix Arabidopsis ATH1 GeneChips® of 10-day old seedlings treated with 20 nM purified PrpL and comparison to published flg22- and oligogalacturonide (OG)-responses. A Venn diagram shows the similarity of expression behavior (|fold change| > 2) in response to the three treatments. b, Defense gene induction levels measured by RT-qPCR in 10-day old Col-0 seedlings treated with 20 nM purified PrpL or 20 nM flg22 for 1 hour (WRKY29, 30, and 33) or 6 hours (GST6, ERF1, and CYP71A12). The data represent the mean ± s.d., n = 3 biological replicates, each containing 8 seedlings.