CYP2D6 and autoimmune hepatitis: Therefore, in this study, the Gas Chromatography-Mass Spectrometer (GC/MS) coupled with 16S rRNA gene sequencing techniques were performed to study the effects of YCHD in treating AIH by detecting the changes in the species and abundance of intestinal flora and intestinal flora metabolites, with an AIH mice model induced by the adenovirus vectors that overexpress human cytochrome P450 family 2 subfamily D member 6 (Ad-CYP2D6), to reveal the uncovered intrinsic interaction between YCHD, AIH, and intestinal microflora (15).