SOB: 2% Vegetable peptone (or Tryptone) 0.5% Yeast Extract 10 mM NaCl 2.5 mM KCl 10 mM MgCl2 10 mM MgSO4 SOC: SOB + 20 mM Glucose LB agar: 1% Tryptone 0.5% Yeast Extract 0.17 M NaCl 1.5% Agar Blue/White Screening: X-gal 80 µg/ml IPTG* 0.3 mM * Omit IPTG for potentially toxic genes