Marc's Modified Ringer Solution (MMR) (10× stock)
1 m NaCl
20 mm KCl
10 mm MgSO4
20 mm CaCl2
50 mm HEPES (pH 7.5)
Prepare a 10× stock in deionized H2O, adjust the pH to 7.8 with NaOH, and sterilize by autoclaving. Store solution indefinitely at room temperature.
