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Psoralen has no effect on osteoblast proliferation. A) Cell viability assays showed that Psoralen had no cell toxicity when used at concentrations ranging from 0 to 100 µM. B) MTT assays showed that Psoralen did not have significant effects on cell growth at the concentrations used (1–100 µM) after 2-d treatment in primary mouse calvarial osteoblasts.
