*2.10. Water Uptake Measurements*

Electrospun GelMA scaffolds discs (1 cm in diameter) were cut and weighted (Wo). Then, samples were immersed in PBS at room temperature. After predetermined immersion times, mats were retrieved and weighted (Wt). The water retention (WR) at time t was calculated according to the following equation:

$$\text{WR(\%)}=(\text{Wt}-\text{Wo})/\text{Wo}\times100,\tag{1}$$
