Differentially expressed fungal and plant genes organized by molecular function GO categories. Organization of all E. festucae (A) and perennial ryegrass (B) genes differentially expressed between the wild-type-infected and ΔsakA mutant-infected samples is by molecular function GO categories. Bars show the number of genes within each category that are up- or down-regulated in the ΔsakA mutant-infected sample relative to the wild-type-infected sample. Categories are as follows: antioxidant activity (GO:0016209), binding (GO:0005488), catalytic activity (GO:0003824), electron carrier activity (e- carrier; GO:0009055), E. festucae unique genes (Ef unique), enzyme regulator activity (Enzyme reg.; GO:0030234), perennial ryegrass unique genes (Lp unique), nutrient reservoir activity (GO:0045735), protein tag (GO:0031386), disease resistance genes (Resistance; non-GO category), structural molecule activity (GO:0005198), transcription regulator activity (Trans. reg.; GO:0030528), molecular transducer activity (Transducer; GO:0060089), transporter activity (GO:0005215), transposase activity (GO:0004803), and molecular function unknown (Unknown; non-GO category).