Cytocompatibility of nanocomposite hydrogels. (A) C3H10T1/2 mouse mesenchymal cells were tested in culture in direct contact with hydrogels with and without nanoplatelets. Final hydrogel content was 10% dextran aldehyde, 2% LAP, 12.3% dendrimer amine, and 3% MMT. Following 1 and 5 days in direct contact with the hydrogels, cells were assayed for viability by live (green)/dead (red) staining; the hydrogel, visible at the right of each image, also stained green. (B) Cell proliferation and viability was quantified by the PrestoBlue assay over 5 days when compared to untreated control cultures.