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Gene expression of (A) COL1A2, (B) COL2A1, (C) ACAN, and (D) GAG/DNA quantification of agarose, agarose-collagen 2 mg/mL, agarose-collagen 4.5 mg/mL, and collagen hydrogels at days 1, 7, and 21 after fabrication. n = 3 biological replicates, mean ± SD; *p < 0.05, **p < 0.01, ***p < 0.001; light gray asterisks on bars indicate a statistically significant difference compared to all other hydrogel types at the same day.
