Which of the following was not a component of the metabolic engineering strategy for artemisinic acid production?

A) a Met-inducible module to increase flux to the artemisinin pathway
B) incorporation of a mutant yeast allele to increase production of an artemisinic acid precursor
C) expression of multiple Artemissia annua genes in yeast
D) a cytochrome P450
E) a TetR repressor system to decrease flux to competing pathways