Xgal

(= 5-bromo-4-chloro-3-indolyl-b-D-galactoside) Chromogenic substrate for the enzyme beta-galactosidase, yielding an intense blue colour. Very widely used in blue-white colour selection of bacteria containing recombinant plasmids, and in histochemistry of tissues/cells expressing beta-galactosidase as a reporter gene.
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