The cellular aggregates formed by SC were dispersed into a single-cell suspension by incubation in TrypLE Express (Thermo Fisher Scientific) at 37°C, then 3 μL of the cell suspension at a concentration of 2.5 × 107 cells/mL were smeared using Smear Gell (Genostaff), according to the manufacturer’s protocol. Subsequently, c-peptide immunostaining was performed, and the rate of c-peptide-positive cells was determined by manually counting 50 random fields at 200× magnification in 5 independent samples.
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