| X-Gal and IPTG are commonly used for blue/white screening of bacterial colonies to distinguish bacterial or phage clones after transformation experiments. In combination with suitable bacterial cloning vectors, host strains, and IPTG, X-Gal provides an easy way to distinguish between positive and negative clones after transformation. Omega Bio-Tek X-Gal is a highly pure molecular biology grade chemical for colorimetric detection of b-galactosidase activity and is supplied as a white crystalline powder, molecular weight 408.6. Omega Bio-Tek IPTG is a highly pure molecular biology grade chemical for inducing expression of the lac promoter and its derivatives. IPTG is supplied as a white crystalline powder, molecular weight 238.3. | |