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Quantitative evaluation of mRNA levels via real-time PCR of RUNX2 (A), OSX (B) and OCN (C) after 4 different wavelengths (420, 540, 660 and 810 nm) PBM. Data are expressed as mean ± SD. Experiments were carried out using two dishes each in three experiments (n = 6). #p < 0.05, ##p < 0.01, ###p < 0.001.
