*2.6. SDS-PAGE and Western Blotting*

A standard SDS-PAGE and Western blotting was carried out according to previously established protocols [14]. The primary antibodies used in this study were all purchased from AbCam (Taipei, Taiwan) unless otherwise specified: anti-STAT3 (ab119352, 1:1500); anti-IL-6 (ab6672, 1:500); anti-Sox2 (ab93689, 1:800); anti-Nestin (ab105389, 1:800); anti-CD9 (ab92726, 1:400); anti-CD63 (ab217345, 1:400); anti-CD81 (ab79559. 1:400); anti-actin (ab179467, 1:2000); and anti-tubulin (ab6046, 1:1000).
