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MTT analysis of HaCaT proliferation and viability, following treatment with 0.05 g/L clay suspensions or leachates (filter sterilized clays) over 168 h, versus untreated HaCaTs. Results are presented as mean ± SEM, n = 3 independent experiments. Significance at * p < 0.05, ** p < 0.01, *** p < 0.001 and **** p < 0.0001 versus untreated controls.
