Fig. 2.

The methacrylation mechanism and photocrosslinking process of methacrylated acellular cartilage matrix hydrogels. A) The methacrylation mechanism of GelMA and ACMMA, as well as the photocrosslinking mechanism from the flowable pre-gel solution to cured hydrogels under blue light irradiation (405 nm, 20 mW/cm²). B) ¹H NMR spectra of GelMA, ACMMA, and the photocrosslinking process of the ACMMA/GelMA gel precursor (the red arrows indicate the methacrylamide group signal peaks at 5.4 and 5.6 ppm). C) The photocrosslinking process and bioprinting process of lattice-shaped constructs based on ACMMA-based bioink. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)