Figure 3:
SEM images of four groups of porous silk fibroin scaffolds after degradation for 0 day (A
_{0}
, B
_{0}
, C
_{0}
, D
_{0}
), 6 days (A
_{6}
, B
_{6}
, C
_{6}
, D
_{6}
), 18 days (A
_{18}
, B
_{18}
, C
_{18}
, D
_{18}
) (scale bar = 500
μ
m).