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The crude methanolic extract obtained from Verbascum nigrum aerial parts (VNE) and its six fractions (VNF1–VNF6) were initially screened regarding their effects on the viability of immortalized HaCaT keratinocytes and A431 epidermoid carcinoma cells (MTT assay, 24 h). None of the tested samples affected the viability of HaCaT cells in a concentration range of 25–150 μg/mL. VNE and VNF4 exhibited significant...