Growth factor expression in primary pig vocal fold epithelial cells.

<p>Agarose gel electrophoresis of PCR products shows expression of EGF (lane one), TGFβ1 (lane two), and the positive control (lane five) in primary pig vocal fold epithelial cells at the expected product sizes. Negative water controls (W) for EGF and TGFβ1 are shown in lanes three and four, respectively.