T7 expression system - Wikipedia
https://en.wikipedia.org/wiki/T7_expression_system
WebMechanism. An expression vector, most commonly the pET expression vector, is engineered to integrate two essential components: a T7 promoter and a gene of interest downstream of the promoter and under its control. The expression vector is transformed into one of several relevant strains of E. coli, most frequently BL21 (DE3).
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