The authors analyzed by microarray the transcriptome of kynurenine-treated glioma and found an AHR signature, characterized by an upregulation of AHR-target genes such as CYP1B1 (Cytochrome P450 family 1 subfamily B member 1) and TIPARP (TCDD-inducible poly-ADP-ribose polymerase). The gene discussed is CYP1B1; the disease is glioma.