Marc's Modified Ringer's (MMR) for Xenopus (1×)
| HEPES (free acid) | 5 mm |
| EDTA | 0.1 mm |
| NaCl | 100 mm |
| KCl | 2 mm |
| MgCl2 | 1 mm |
| CaCl2 | 2 mm |
| Prepare as a 25× stock and adjust pH to 7.8 with NaOH. Sterilize by autoclaving and store at 4°C. |
| HEPES (free acid) | 5 mm |
| EDTA | 0.1 mm |
| NaCl | 100 mm |
| KCl | 2 mm |
| MgCl2 | 1 mm |
| CaCl2 | 2 mm |
| Prepare as a 25× stock and adjust pH to 7.8 with NaOH. Sterilize by autoclaving and store at 4°C. |