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Cell viability following tissue exposure. An in vitro cell culture of human skin was dosed with PTTC and PTTC emulsion. The cell viability was calculated using an MTT assay to determine irritancy. Cell viability greater than 50% indicates a formulation is non-irritant. All values represent mean ± standard deviation (p value <0.05). NC, negative control (saline); PC, positive control (5% sodium dodecyl sulfate).
