Figure 2. Proliferation of rate of primary fibroblasts.

Relative proliferation was evaluated using the MTT assay, as described in Materials and Methods. LAF, MAF and PF demonstrated similar proliferation rates. A single exposure to smoke had no effect on LAF and PF proliferation, but slightly decreased growth of MAF. Data are mean+/−SD. *P<0.05, **P<0.01, ***P<0.001.