| protein | 0.37 |
| a mixture of antibodies | 0.25 |
| purified | 0.72 |
| produced | 0.68 |
| raised in rabbit | 0.51 |
| used to neutralize bact… | 0.37 |
| used to neutralize virus | 0.37 |
| produced by conventiona… | 0.32 |
| expensive to produce | 0.29 |
| purchased | 0.25 |
| directed against native… | 0.25 |