A second problem with E. coli is the limited supply of complementary NADPH:cytochrome P450 reductase that is also essential for the correct function of reconstituted plant cytochrome P450 enzymes.

• 有关大肠杆菌的第二个问题是：限制补充NADPH，细胞色素P450还原酶对于再造植物细胞色素P450酶的正确功能所必须的。