Performance of NPS-HomPPI Compared with Web-based PPI Servers. Performance was evaluated on four different protein complex types from Benchmark180: (a) Enzyme-inhibitors, transient. (b) Non-enzyme-inhibitors (NEIT), transient. (c) Hetero-dimers, obligate. (d) Homo-dimers, obligate. Servers compared were: NPS-HomPPI: red circles; Meta-PPISP: green squares; Cons-PPISP: blue triangles; Promate: brown stars; PIER: purple stars; PSIVER: yellow stars.