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Hovatta O, et al. A culture system using human foreskin fibroblasts as feeder cells allows production of human embryonic stem cells. Hum. Reprod. 18: 1404-1408, 2003. PubMed: 12832363
Ellerstrom C, et al. Facilitated expansion of human embryonic stem cells by single-cell enzymatic dissociation. Stem Cells 25: 1690-1696, 2007. PubMed: 17379766