Medchemexpress, HY-15921 5g IPTG Isopropyl β-D-thiogalactoside CAS:367-93-1 Formula:C9H18O5S Purity:98% IPTG is a molecular mimic of allolactose, a lactose metabolite that triggers transcription of the lac operon, and it is therefore used to induce protein expression where the gene is under the control of the lac operator. Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.