Fig. 6

Functional analysis of the larynx. Twelve weeks post-injection, the rat larynges were isolated and analyzed using a high-speed camera setup. A Representative images of each minimal glottal gap (red-colored area) of the vocal fold (arrowhead, right vocal fold; arrow, left vocal fold). B The glottal gap area was significantly reduced in the SP group compared to the other groups. C Videokymographic analysis of vocal-fold motion. D The phase difference of the vocal fold during vibration was also smaller in the SP group than in the other groups, but the difference did not reach statistical significance (*p < 0.05, **p < 0.01, ***p < 0.005)