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Percentages of differentiated (a) NPCs, (b) neurons (NF-positive), (c) astrocytes (GFAP-positive), and (d) oligodendrocytes (O4-positive) on the neutral and PLL-grafted PEGDA hydrogels after 7-day culture in differentiation media. *, p < 0.05. +, p < 0.05 relative to other hydrogels.
