5-Bromo-4-Chloro-3-Indolyl β-D-Galactopyranoside

Full Name
5-Bromo-4-Chloro-3-Indolyl β-D-Galactopyranoside

Keywords
X-Gal

Background
5-Bromo-4-Chloro-3-Indolyl β-D-Galactopyranoside (X-Gal) is a chromogenic substrate cleaved by β-galactosidase to yield an insoluble blue precipitate, standard for blue-white colony screening.
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