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IPTG (Isopropyl-ß-D-thiogalactopyranoside) is a non-metabolizable galactose analog that induces expression of the lac operon in Escherichia coli.
X-Gal (5-bromo-4-chloro-3-indolyl-ß-D-galactopyranoside) is a ß-galactosidase substrate. In the presence of ß-galactosidase, X-Gal is hydrolyzed and yields a blue precipitate.