Freshly isolated mice islets were introduced to the atelocollagen sponge scaffold immediately before the Live/Dead assay. Calcein-AM (green, live) and ethidium homodimer (red, dead) were used to stain the islet-carried scaffold and naked islets according to the manufacturer’s protocol (R37601, ThermoFisher Scientific). Images were acquired with an Olympus BX51-FL (Olympus, Japan). Quantification of the cell viability was carried out by calculating the area of green (live) and red (dead) fluorescence using ImageJ. % cell viability: the green area versus the total islet area.
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