“…However, natural materials often bring concerns such as weak mechanical strength and quick degradation rates [ 50 ]. Currently, Matrigel (or similar product such as Geltrex), which consists of a mixture of extracellular matrix proteins, proteoglycans, and growth factors derived from Engelbreth–Holm–Swarm sarcoma cells, has been extensively used as substrate in hepatic differentiation of stem cells [ 30 , 51 , 52 , 53 , 54 , 55 ]. However, one known disadvantage of Matrigel is that it suffers from potential batch-to-batch variability resulting in difficulty in generating reproducible cultures [ 56 ].…”