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Table 1 A comparison of human PPI data coverage distributed over several sub-categories

From: HAPPI-2: a Comprehensive and High-quality Map of Human Annotated and Predicted Protein Interactions

  HAPPI-1 HAPPI-2 Increase ratio
All Interactions 604,741 2,922,202 483%
5-star 37,754 175,476 464%
4-star 33,733 167,123 495%
3-star 71,036 298,149 419%
2-star 189,150 854,189 452%
1-star 273,068 1,427,265 523%