The soybean genome encodes a family of plant elicitor peptides (GmPeps). (A) Conserved motifs of GmPeps are underlined and in bold. GmPROPEP4 and GmPROPEP5 precursors are each predicted to generate two encoded peptides, designated ‘a’ and ‘b’. (B) Carboxyl terminus of the peptide confirmed to be the following motif beginning at residue 15 (S/GxGxxQxN). (C) A phylogenetic tree was generated by ClustalW2. Included in the alignment are GmPep1 (Glyma10g36290), GmPep2 (Glyma20g31306), GmPep3 (Glyma13g34221), GmPep4a,b (Glyma13g34210), GmPep5a,b (Glyma13g34235), GmPep6 (Glyma04g39760) and AtPep1 (At5g64900).