Figure 1.

Drugs or vehicles do not alter IHMGEC survival or proliferation. Cells were exposed to treatments or vehicles for 5 days in keratinocyte serum-free medium (KSFM) and counted using a hemocytometer. Cells were exposed to drugs or vehicles at different times under the same conditions. (A) Cell counts from three experiments (mean ± standard error) are shown. (B) One representative of three control experiments is shown. The combination of epidermal growth factor (EGF, 5 ng/mL) and bovine pituitary extract (BPE, 50 μg/mL) is known to induce IHMGEC proliferation. **P < 0.01, ***P < 0.001, respectively, compared to all other conditions.