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UFLC MS/MS analysis of SM species in cells and exosomes. The analysis was performed as reported in the Section 4. Data are expressed as ng/mg protein and represent the mean ± SD of three independent experiments performed in duplicate (case number: 6). * p < 0.05 versus the control sample, § p < 0.05 versus cells CTR, control sample; VD3, vitamin D3 sample.
