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(A) Representative Molecular Probes® Live/Dead stained fluorescence images of different types of printed human alveolar cells: A549 human lung epithelial cells (top), EA.hy926 human endothelial cells (middle), and MRC-5 human lung fibroblasts (bottom) at varying cell concentrations, at different time points post-printing (day 1, 4, and 7); scale bar: 200 μm. (B) Proliferation profile of printed and non-printed (control) human alveolar cells over a period of 7 days.
