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Macrophage accumulation and migration into 4T1 tumor spheres: a) Analysis of the total cell numbers associated with the spheroid; b) 3D reconstruction of confocal laser scanning microscopy images of 4T1 spheres (blue) invaded by macrophages (green) and dead cells was imaged by DRAQ7 (red). Macrophages were pre-treated with nAb-PTX or MSV-nAb-PTX.
