Table 1.

Summary of samples prepared at different conditions.

Test	GelMA concentration (w/v)	TG content
Rheology, swelling, ratio	10, 8, and 6%	–, +
Metabolic, activity, lap shear	10%	–, +
Compression, push out, degradation	10, 8, 7, and 6 %	–, +

Note for the degradation studies, the total GelMA concentration included 1% w/v fluorescently labeled GelMA. Additionally, 7% GelMA was tested with transglutaminase only, as it was selected to match the stiffness of 8% GelMA without transglutaminase (as later described).