Table 1: Relative content of secondary structure of four groups of silk fibroin scaffolds before degradation (%).

Groups A B C D Side chain 3.79 3.44 4.69 5.35 -sheet 25.65 28.34 34.30 39.94 Random coil 18.28 22.67 21.15 18.15 -form 17.56 10.37 10.54 9.45 Turns 34.72 35.18 29.33 27.11