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Relative cellular viability as a function of the heat treatment temperature for the samples heat treated at 350 °C, 500 °C, 800 °C, 1000 °C, and 600 °C + 1000 °C. The negative control is cells that are cultured in a non-cytotoxic environment, which is the reference for the relative populations calculation. When a relative population drops below 90%, that sample begins to display a varying degree of cytotoxicity.
