One, No One, One Hundred Thousand - The Multifaceted Role of Macrophages in Health and Disease - Part B, Volume 369 provides in-depth reviews on the last progresses on the role of macrophages in health and diseases, with a special focus on the role of macrophages during development. New chapters cover The role of salivary gland macrophages in infection, disease and repair, Reprogramming or replacing brain macrophages to treat neurodegenerative disease, Targeting macrophages for cancer immunotherapy, Heart Macrophages at steady-state and disease: simple bystanders or active players?, Macrophages in the liver, and Developmental programming of macrophages.