Antibiotics & Selection Reagents

IPTG (Isopropyl-ß-D-thiogalactopyranoside) is a non-metabolizable galactose analog that induces expression of the lac operon in Escherichia coli.

Ampicillin Sodium Salt

X-Gal (5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside) is a β-galactosidase substrate. In the presence of β-galactosidase, X-Gal is hydrolyzed and yields a blue precipitate.