Fig. 1

The morphology of silk fibroin microspheres characterized by SEM, including amplification factor × 100 (A), amplification factor × 300 (B), amplification factor × 1000 (C), amplification factor × 1000 (D), cross section with amplification factor × 1000 (E), amplification factor × 3000 (F); size distribution of SFMS (> 20 μm) (G); IR spectra of SFMS (H); TEM of AuNPs-loaded SFMS (< 5 μm) with arrows pointing to AuNPs (I); Viability of HUH-7 cells incubated with SF, SF-AuNPs, ¹³¹I-SF and ¹³¹I-SF-AuNPs for 24 and 48 h (J); The viability of HUH-7 cells treated with SFMS, DOX-SFMS for 6 and 15 h (K)