Cytochrome P450, family 9, also known as CYP9, is a cytochrome P450 family found in Insect genome, [1] [2] CYP9 and insect CYP6 family belong to the same clan as mammalian CYP3 and CYP5 families. [3] The first gene identified in this family is the CYP9A1 from the Heliothis virescens (tobacco budworm), which is involved in thiodicarb insecticide resistance. [4] Subfamily CYP9A in Lepidopteran play important roles in insecticide resistance, can metabolize esfenvalerate efficiently. [5]