| ZnCl2 conc, mM | ALAS activity, nmoles ALA formed h−1 g−1 fr wt In Light | ALAS activity, nmoles ALA formed h−1 g−1 fr wt In Dark | ALAD activity, nmoles PBG formed h−1 g−1 fr wt |
| 0 | 88 ± 6 (100) | 83 ± 5 (100) | 200 ± 7 (100) |
| 0.001 | 88 ± 3 (100) | 93 ± 8 (112) | 249 ± 4** (125) |
| 0.1 | 99 ± 8 (113) | 93 ± 7 (112) | 263 ± 4** (132) |
| 1 | 92 ± 5 (105) | 91 ± 7 (110) | 279 ± 5*** (140) |
| 5 | 97 ± 5 (111) | 96 ± 2 (116) | 345 ± 11*** (173) |