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While M1 macrophages are highly pro-inflammatory and microbicidal, M2 macrophages and the related tu- mor associated macrophages (TAMs) regulate tissue remodeling and angio- genesis and can display immunomod- ulatory activity. In July issue of Cell Research, Zhang et aL show that ROS production, critical for the activation and functions of M1 macrophages, is necessary for the differentiation of M2 macrophages and TAMs, and that antioxidant therapy blocks TAM differentiation and tumorigenesis in mouse models of cancer.