Chakrabarti R, Celià-Terrassa T, Kumar S, Hang X, Wei Y, Choudhury A, Hwang J, Peng J, Nixon B, Grady J, DeCoste C, Gao J, van Es J, Li M, Aifantis I, Clevers H, Kang Y. Notch ligand Dll1 mediates cross-talk between mammary stem cells and the macrophageal niche. Science. 2018;360(6396). PMCID: PMC7881440