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A–H: Low-density cultures of MUM2B cells in Matrigel followed throughout 10 days. The cell of interest appears in boxes at low magnification in A, C, E, and G and at higher magnification in B, D, F, and H. Throughout the 10 days, the elongated MUM2B cell retracted, leaving behind a footprint in the Matrigel. Original magnifications: ×50 (A, C, E, G); ×100 (B, D, F, H).
