| precursor chemical | 1.65 | They have also set up mini-cartels dedicating to smuggling precursor chemicals, Merchan said. | ||
| precursor cell | 0.86 | Studies to date show that the precursor cells are not found in the human cortex. | ||
| precursor protein | 0.33 | The enzyme works by cutting beta-amyloid from another compound called amyloid precursor protein, or APP. |