Fig. 3From: A novel human 3D lung microtissue model for nanoparticle-induced cell-matrix alterationsMicrotissue viability following exposure to nanomaterials. Viability was assessed using the WST-8 assay after 4 days (a) or 7 days of exposure (b) to 0.5–10 μg/mL of the test nanomaterials. * p < 0.05, ** p < 0.01, ***p < 0.001 relative to untreated microtissues. (N = 3)Back to article page