Figure 1From: An improved 3D tetraculture system mimicking the cellular organisation at the alveolar barrier to study the potential toxic effects of particles on the lung Z -stack image series to evaluate the distribution of A549 and EA.hy 926 cells on opposite sides of a transwell insert. The cells form a closed monolayer on both sides of the 1 μm transwell membrane. Cellular membranes are stained in red (cell mask deep red dye), nuclei in blue (DAPI). X–y projection with the respective side views (Magnification: 630x).Back to article page