The procedures were detailed in a previous study54 (link). The mouse embryonic fibroblast cell line NIH/3T3 was purchased from the Bioresource Collection and Research Center (BCRC), Taiwan. A complete cell culture medium composed of Dulbecco’s modified Eagle medium (DMEM, Gibco) and 10% calf serum (CS, Invitrogen) was used for cell culture. The cells were incubated in tissue culture polystyrene flasks (Corning) in 5% CO2 at 37 °C until 90% confluence before seeding into the microfluidic chip.
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