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Phototoxicity assay using in-house Reconstructed human skin (RHS)—MTT assay, the positive control 3% ketoprofen was phototoxic (∆ > cut-off 30%) and 0.5% fucoxanthin was non-phototoxic (cell viability ~ 99%) when irradiated (yellow bar) or not (blue bar), mean ± SD, n = 2 in two independent experiments.
