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Caption : supplementary figure 1 compressive modulus calculations an example stress-strain curve (black) is shown where the strain calculated from the ratio of the displacement compared to the construct starting height and the stress was calculated from the measured load divided by the cross-sectional area. important strains are denoted by dashed red lines. to account for the point-of-contact with the testing apparatus, the point at which the load reached 0.02 n (a) was used to calculate an “adjusted” strain. then the 10% (b) and 15% (c) adjusted strains were found and fit to a line. the slope of this line (red) was reported as the estimated compressive modulus.

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Caption : supplementary figure 2 biopolymer methacrylation (a) nmr of methacrylated hyaluronic acid, success of methacrylation is evaluated from the 1.85ppm peak. (b) nmr of methacrylated chondroitin sulfate, success of methacrylation is evaluated from the 5.5-6.0ppm peaks.

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Caption : supplementary figure 3 hydrogel crosslinking is cell-compatible cell viability in bulk gels was evaluated after 24 hours using a live/dead stain where live cells are green and dead cells are red.

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Caption : supplementary figure 4 masson’s trichrome staining the pellet culture used as a positive control was stained alongside mouse cartilage using masson’s trichrome. the deep blue color corresponds to collagens.