Three grams of NaCl, 2.5 g Bacto™ Peptone (Becton Dickinson, Heidelberg, Germany) and 17 g Bacto™ Agar (Becton Dickinson, Franklin Lakes, NJ, USA) were dissolved in 975 mL distilled water. After autoclaving, 1 mL cholesterol in ethanol (5 mg/mL), 1 mL 1 M CaCl2, 1 mL 1 M MgSO4, and 25 mL 1 M potassium phosphate buffer (pH 6.0) (108.3 g KH2PO4, 35.6 g K2HPO4, H2O to 1 L) were added in this order.
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