Filtering semantic relations, with official symbol for each extracted gene, at increasing argument distance. Argument distance indicates the maximum distance of each argument from the indicator in the relations retained after filtering. "All" refers to no filtering. Precision (P), Recall (R), and F score (F) were calculated as follows: P = rc/(rc+ri), R = rc/(rc+dc), F = 2*P*R/(P+R) with rc the retained correct relations, ri the retained incorrect relations, and dc the discarded correct relations. Dotted lines indicate limits of 95% confidence intervals.