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Postpartum involuting lobules have increased immune cell infiltrate.
Immunohistochemical staining for the general leukocyte marker CD45, the macrophage marker CD68, the B cell marker CD19, and the T cell markers CD4 and CD8 in actively involuting (Inv) and lactating (Lac) human breast tissue lobules. Scale bar = 100 μM; inset = representative positively-stained cell at 6× magnification of the larger image
