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Log-transformed matrix metalloproteinase-9 (MMP-9) gene expression ratios for phonation (1) and control (2) groups. Results revealed a non-significant increase in MMP-9 gene expression from rabbits receiving experimental induced phonation compared to controls (mean (SD): −2.3625 (.91368) vs. −3.8245 (1.1040), respectively, P = .075).
