Power frequency MF downgrades EGFR ligand release.

<p>FL cells transfected by TGF-α were grouped into 4 conditions: sham exposure, treated with PMA as a positive control, 0.4 mT power frequency MF exposure, and treated with PMA plus power frequency MF exposure. The cells were washed, and conditional medium was added. After 30 min, the medium from each group was collected as the corresponding pre-sample. Then, medium was collected again for all groups after incubation in the indicated conditions for 30 min. OD data were measured for each sample or pre-sample. The data presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0087626#pone-0087626-g007" target="_blank">Figure 7</a> are the ratio of the OD of sample (OD405S) over the OD of pre-sample (OD405P). P<0.05 (*) between each two group. The detailed information of experimental conditions and repeating numbers of samples is seen in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0087626#pone-0087626-t001" target="_blank">Table 1</a>.