| Addition | [3H]-Thymidine Incorporation (cpm) | Number of experiments (n) |
| None | 1350 ± 126 | 5 |
| Ouabain 1 × 10−4 M | 1289 ± 125 | 5 |
| Calphostin C 1 × 10−9 M | 1380 ± 130 | 5 |
| Tetrodotoxin 1 × 10−7 M | 1293 ± 127 | 6 |