IPC differentiation. (A) UC-MSCs culture before IPCs differentiation induction. (B) UC-MSCs aggregated together during the differentiation stage 2. (C) Insulin clusters were formed at late stage 2. (D) IPC clusters at the end of the last stage. (E) Adding laminin 411 group formed the IPC clusters. (F) DTZ stained the IPCs cluster. Representatives are shown at 100 × magnification.