Only powdery mildew ( Blumeria ) and rust ( Puccinia ) fungi encode Y/F/WxC-effector candidates. (A) The proteome of Puccinia graminis f.sp. tritici was screened for proteins with predicted signal peptide, with and without Y/F/WxC-motif, which were plotted against their length. (B) Proteomes of six fungi and an Oomycete were screened for proteins with a predicted signal peptide as well as a Y/F/WxC-motif, which were plotted cumulatively against their length. Only the 105 Bgh Y/F/WxC-effector candidates with known lengths are plotted. The proteomes were derived from publically available genome databases and EST library (Bgh and Pt) databases. Only Y/F/WxC-motifs after the predicted N-terminal signal peptide and within the first 45 amino acids from the N-terminal methionine were included.