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Evaluation of the viability of RAW 264.7 macrophage cell. Culture media were prepared by mixing with different amount of suspended layer from the DMEM mixed with 1% of QELBY ceramic powder and left for 48 hours. The blue and red bars indicate the length of incubating time, 24 hours and 48 hours, respectively, with the prepared media. Data are mean ± SD (n = 4). Bars with different superscript for each standing time are significantly different at p < 0.05.
