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Expression levels of ECM genes in fibroblasts from the vocal fold, trachea, and esophagus. mRNA levels for procollagen I (A), procollagen III (B), elastin (C), and HAS I (D) were examined by quantitative real-time PCR and are normalized to those of fibroblasts from the vocal fold. Values are expressed as means ± SEM. *, P < .05; **, P < .01; ***, P < .001.
