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The percentage velocity lag of the particles (○), single BCCs (□), and BCC aggregates (Δ), in comparison to the undisturbed Poiseuille flow velocity as a function of η, where η = dp/H, at (a) the center of the microchannel (w = 0.5) and (b) the near wall region (w = 0.8). The purple markers represent the MCF-7 cells, and the orange markers represent the MDA-MB-231 cells. The η values shown are based on the average non-dimensionalised diameters for each particle/BCC grouping.
