Effectively screen colonies with X-Gal, an inert chromogenic substrate for beta-galactosidase which hydrolyzes X-Gal, forming an intense blue precipitate.
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Stabilize enzymes and other proteins which possess free sulfhydryl groups with DTT, shown to restore activity lost by oxidation of these groups in vitro.
Thermo Scientific 25 mM MgCl2 is an aqueous solution of 0.22 μm membrane-filtered magnesium chloride, used for optimization of magnesium ion concentration in PCR.