The rheological properties of the uncured precursor solutions were characterized with a modular compact rheometer (MCR, Anton Paar, Austria) equipped with a 50 mm, 1° cone plate geometry and Peltier stage temperature control system. The temperature was set to 25 °C. First, HA-AE, HA-NB and HA-MA were dissolved at 4% w/v in PBS without photoinitiator and dithiol crosslinker.