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The predicted size of the mature microbe-associated molecular patterns (MAMPs) from crystal structure of Pattern Recognition Receptor (PRR)-ligand pairs. (A) Chitin in atCERK1, (NAG)4 = 2.07 nm; (B) Chitin in OsCEBiP, (NAG)3 = 1.54 nm; (C) flg22, flg22 in Flagellin Sensing 2 (FLS2) length of flg22 = 4.06 nm; (D) atPEP1 in atPEPR, length of atPep1 = 4.4 nm.
