Fig. 4
From: Permeability across a novel microfluidic blood-tumor barrier model
Representative timelapse images showing passive diffusion of Free TRD from the outer to the central compartment. Intensity of fluorescence increases linearly over time 0 min (a), 30 min (b), 60 min (c), and 90 min (d). e Linear concentration of tracer movement versus time to determine diffusion constants (Kin). White rectangle scale bars 500 μm