| Species | Preparation | Ki (µM) | Reference |
| Frog (rod cells: receptor cells) | Isolated taste cells | 0.3 | [44] |
| Frog (wing cells: glial-like cells) | “ | 3.3 | [49] |
| Hamster (fungiform papilla) | Isolated taste buds | 0.2 | [45] |
| Rat (fungiform papilla) | “ | 0.01 | [27] |
| “ | “ | 0.2 | [52] |
| “ | “ | 0.11 | [56] |
| Rat (foliate papilla) | “ | 0.1 | [27] |
| Mouse (fungiform papilla) | Single taste bud in semi-intact preparation | 0.2 | [58] |