AHR and B-cell chronic lymphocytic leukemia: Next, in order to analyze the impact of AHR knock-out in leukemic B cells, CLL development in the new transgenic model (Eμ-TCL1 CD19Cre/WT Ahrfl/fl) and corresponding control (Eμ-TCL1 CD19Cre/WT AhrWT/WT) was monitored over several months.