SOB: 2% Vegetable peptone (or Tryptone) 0.5% Yeast Extract 10 mM NaCl 2.5 mMKCl 10 mM MgCl2 10 mM MgSO4 SOC: SOB + 20 mM Glucose LB agar: 1% Tryptone 0.5% Yeast Extract 0.17M NaCl 1.5% Agar