The Ckmt1 promoter reporter construct has been described previously (Fenouille et al, 2017 (link)). Mouse macrophage cell line RAW 264.7 (ATCC, TIB‐71) was cotransfected with the Ckmt1 promoter construct expressing Gaussia Luciferase and Secreted Alkaline Phosphatase (GeneCopoeia) and the Zeb1 plasmid using GenJet DNA Transfection Reagent (SignaGen Laboratories) in accordance with the manufacturer's protocol. Transfection medium was replaced by fresh medium containing RANKL about 6 h after transfection. After 48 h of incubation, medium was collected for parallel bioluminescence assays of Gaussia luciferase and secreted alkaline phosphatase using Secrete‐Pair Dual Luminescence Assay Kit (Genecopoiea), using a SpectraMax L (Molecular Devices) plate reader.