Minimum Essential Medium Eagle (Modified), with Earle's Salts and L-Glutamine, without Sodium Bicarbonate was originally prepared by Harry Eagle and is one of the most popular cell culture media. The formulation differs from the original in that the concentrations of some of the vitamins have been increased slightly; in some, the amino acids differ by decimal amounts. In some formulation, the MgSO4 concentration differs from that of Eagle but agrees with that quoted by Parker (Parker quotes 200.00 mg/liter MgSO4.7H2O).