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GAG/DNA content of ATDC5 cells encapsulated inside 6.5 (w/v) PEG hydrogels varying in the cross-linker type (F or R) and RGD content (0 or 150 µM), and cultured over time in 4C chondrogenic medium. 6.5R0 = R cross-linker + 0 µM RGD; 6.5RR = R cross-linker + 150 µM RGD; 6.5F0 = F cross-linker + 0 µM RGD; 6.5FR = F cross-linker + 150 µM RGD. Results depicted as mean ± SD (Two-way ANOVA n = 3; * p < 0.05; *** p < 0.001).
