Figure 1: Chemical structures of photocurable gelatin (gelatin partially derivatized with eosin; eosin content: 2.8 per gelatin molecule) and polyamine (polymer of N,N-dimethylaminopropylacrylamide). The content of the photocurable agent was the photocurable gelatin (20 wt%), the polyamine (5 wt%) and distilled water (75 wt%).