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(A) Schematic process of formation of a microtissue containing a CXCR4+TNBC spheroid and fibroblasts dispersed in collagen. (B) 3D confocal reconstruction of a microtissue containing CXCR4+TNBC spheroids (blue) and fibroblasts (green). Collagen was not stained. The numbers in the red box represent distances in micrometers.
