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Effects of steroid hormones on cell proliferation of fibroblasts from the vocal fold (A), trachea (B), and esophagus (C) estimated from the absorbance (OD450) 48 hours after testosterone (T), estradiol (E2), or corticosterone (CORT) administration at 10−8 or 10−9 M. The OD450 was normalized to that of the control in each trial. Values are expressed as means ± SEM. *, P < .05 vs control; **, P < .01 vs control; ***, P < .001 vs control.
