1 | TS (Tanaka and Scheraga)10 | Distance less than sum of van der waals radii | Oldest statistical potential, 25 proteins |

2 | RO (Robson and Osguthorpe)11 | Included van der Waals, electrostatic, hydrogen bonding, and solvent-dependent interactions | 25 proteins |

3 | MC (Maiorov and Crippen)12 | Backbone–backbone contact if *d*(0, N) < 32 Å and *d*(C, N) > 3.9 Å; a backbone sidechain contact if *d*(N or O, CB) < 5.0 Å and no other atom between the interacting pair closer than 1.4 Å to the line segment joining them; and a sidechain–sidechain contact if *d*(Cβ, Cβ) < 9 Å | 73 proteins |

3 | BL (Bryant and Lawrence)13 | At various distances in 0–10 Å | 161proteins |

4 | TD (Thomas and Dill)14 | Contacts between backbone and Cβ atoms at 5–9 Å | 73 proteins, based on MC |

5 | MS (Mirny and Shakhnovich)15 | Heavy atoms in 4.5 Å | 104 proteins |

6 | VD (Vendruscolo and Domany)16 | Cα atoms in 8.5 Å, optimization based of perceptron criteria | Based on Ref.12 |

7 | BFKV17 | Heavy atoms in 4.5 Å | 1169 proteins |

8 | MJ (Miyazawa and Jernigan)7 | Cα atoms in 6.5 Å | 42 proteins |

9 | MJ (Miyazawa and Jernigan)18 | Modified with new dataset | 1198 proteins |

10 | MJ (Miyazawa and Jernigan)19 | Approximation of equilibrium mixtures of residues with Bethe approximation | |

11 | DT (Krishnamoorthy and Tropsha)9 | Four body statistical potential | Two datasets (1563 and 1167 chains) |

12 | Feng et al.8 | Four body contact potential from reduced amino acids alphabet | Two datasets (774 and 513 chains) |

13 | BT (Betancourt and Thirumalai)20 | | Rescaled MJ matrix |

14 | HL (Hinds and Levitt)21 | Atom–atom contact in 4.5 Å | 246 proteins |

15 | GKS (Godzik et al.)22 | Atom–atom contact in 4.5 Å | 381 proteins |

16 | TE (Tobi et al.)23 | Matrices for different distance cut-offs (2–9) | 572 proteins |

17 | MSBM (Micheletti et al.)24 | Cα atoms in 6.5 Å, Optimization based | |

18 | OPUS-Ca (Wu et al.)25 | Distance dependent pairwise energy with orientational preference | |

19 | Baker and coworkers26, 27 | | Used in Rosetta |

20 | Bolser et al.28 | Distance between Cα and Cβ atoms at different cutoff | Matrix based on degree |

21 | Zhang and Kim29 | Centroids of amino acids in 6.5 Å | Secondary structure based energy matrix |