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. 2022 Mar 7;13(1):19476035221081469. doi: 10.1177/19476035221081469

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© The Author(s) 2022

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Figure 4. — Schematic representation of macrophage phenotypes and their FR-β expression. (A) Macrophage subtypes that can be generated in vitro by stimulating monocytes with GM-CSF or M-CSF. All M-CSF-generated macrophages are FR-β positive. (B) Stimulation of monocytes with corticosteroids generates FR-β-positive anti-inflammatory macrophages. FR-β = folate receptor beta; GM-CSF = granulocyte-macrophage colony-stimulating factor; M-CSF = macrophage colony-stimulating factor.