The quantitative Matrix of HLA-B27
| Amino acid/positions | P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 | P9 |
| A | -1.14 | -1.75 | -1.02 | -1.17 | -0.80 | -1.19 | -1.04 | -1.02 | -1.41 |
| C | -1.53 | -1.75 | -1.75 | -0.93 | -1.07 | -1.07 | -1.07 | -0.93 | -1.30 |
| D | -0.84 | -1.75 | -1.75 | -0.93 | -0.18 | -0.93 | -0.39 | -0.18 | -1.01 |
| E | -1.60 | -1.75 | -1.75 | -1.15 | -1.03 | -1.48 | -1.33 | 1.65 | -1.56 |
| F | 0.29 | -1.75 | 1.06 | 0.58 | -0.22 | 0.00 | 0.58 | -0.58 | -0.22 |
| G | -0.31 | -1.75 | -1.58 | -0.19 | -0.02 | -0.52 | -0.24 | -0.39 | -1.32 |
| H | -1.34 | -1.75 | -1.30 | -1.30 | -0.73 | -0.84 | -1.07 | -0.73 | -1.07 |
| I | -0.61 | -1.75 | -0.73 | -0.39 | -0.55 | -0.22 | -0.46 | -1.24 | -0.39 |
| K | -0.34 | -1.54 | -1.28 | -0.87 | 1.79 | -1.19 | -1.19 | -0.73 | 0.57 |
| L | -0.86 | -1.75 | -0.07 | -1.12 | -1.34 | -0.65 | -1.38 | -1.04 | 1.50 |
| M | -1.34 | -1.75 | -1.75 | -1.17 | -0.22 | 0.00 | -1.07 | -1.24 | -1.07 |
| N | -1.41 | -1.75 | -1.01 | -0.81 | -1.41 | -1.24 | -1.24 | -0.49 | -1.41 |
| P | -1.75 | -1.75 | -1.46 | -0.97 | -0.93 | -0.61 | -1.24 | -1.27 | -1.48 |
| Q | -1.43 | -0.67 | -1.75 | 1.86 | -1.30 | -1.24 | -1.30 | -0.79 | -1.41 |
| R | 1.96 | 7.02 | -1.12 | -1.27 | -1.30 | -1.03 | -0.39 | -0.84 | 0.03 |
| S | 0.04 | -1.75 | -0.66 | -0.73 | -1.43 | 1.93 | -0.55 | -1.43 | -0.93 |
| T | -1.34 | -1.75 | -1.75 | -0.47 | -1.43 | -0.47 | 1.82 | -0.49 | -0.87 |
| V | -1.17 | -1.75 | -1.12 | -0.39 | -0.55 | -0.39 | -0.03 | -1.17 | -0.67 |
| W | -1.17 | -1.75 | -0.39 | -0.93 | -0.52 | -1.17 | -1.17 | -1.07 | -1.17 |
| X | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Y | -0.73 | -1.75 | 2.31 | 1.31 | 1.17 | -0.39 | -0.39 | 1.17 | -0.81 |
| Thresold(%) | 1% | 2% | 3% | 4% | 5% | 6% | 7% | 8% | 9% | 10% |
| Value | 3.54 | 2.07 | 1.01 | 0.13 | -0.61 | -1.26 | -1.80 | -2.26 | -2.65 | -2.97 |