Dissolve 5 g ampicillin sodium salt (MilliporeSigma, A9518) in 50 ml sterilized water. Pass through a 0.22‐μm filter and aliquot into 1.5‐ml vials and store at −20°C for up to 6 months. Bacterial lysis buffer (Gal‐9) 10 mM Tris·Cl with 14 mM β‐mercaptoethanol (pH 7.5) 0.5 M NaCl buffer