Figure 6.

Cytotoxicity in the dark (solid line, round dots) and phototoxicity (dashed line, triangular dots) after 25 J·cm⁻² white light illumination of the Skeletonema marinoi ethanol extract in primary cultures of Normal Human Epidermal Keratinocytes (NHEK). Cells were grown in cell culture medium and treated at obscurity or in the presence of white light with the Skm ethanol extract at doses ranging from 0.3 to 80 µg·mL⁻¹ in cell culture medium. Cell viability was then measured using the MTT assay. All experiments were performed in triplicate.