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Data sharing not applicable to this article as no datasets were generated or analysed during the current study. Supplementary Figure S1. Quantitative real-time PCR analysis of extracellular matrix— and inflammation-related gene expression in the contralateral (right, non-injected) vocal folds, analyzed in the same manner as the injected (left) vocal folds shown in Figure 6 of the original article [1]. (A) Relative mRNA expression levels of collagen I (Col1a1), transforming growth factor-β (TGF-β), and interleukin-1β (IL-1β). (B) Relative mRNA expression level of hyaluronic acid synthase 2 (HAS2). Collagen I and HAS2 expression differed significantly between the Old-Fer and Old groups. TGF-β and IL-1β were significantly elevated in the Old group compared with the Young group, but did not differ significantly between the Old-Fer and Old groups. Data are presented as mean ± SEM. *P < 0.05. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Cheon et al. (2026) studied this question.
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