Table 2. Cross-validation results for protein interaction prediction.

Species	Sensitivity, %	Specificity, %	P value	Strategy
Yeast	50	77	1.1e-25	i
Worm	43	82	1e-13	i
Fly	23	84	5.3e-5	i
Yeast	9	99	1.2e-6	i + ii
Worm	10	100	6e-4	i + ii
Fly	0.4	100	0.5	i + ii

For each species, the specificity and sensitivity of the predictions in 5-fold cross-validation, the significance of the results, and the prediction strategy (see text) are listed.