Fig. 1: Characteristics of the isolated A549-Exos.

A Representative images of TRAP-stained osteoclasts. Scale bar: 100 μm. B Representative TEM image of A549-Exos (scale bar = 200 nm). C Results of nanoparticle tracking analysis reflecting the size distribution of A549-Exos. D Detection of A549-Exos surface markers (CD9 and HSP70) by a Western blot analysis.