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Different levels of So, PC and SM among the HC, MCS and VS groups. Data represent as the mean ± SEM; *P<0.05, **P<0.01, ***P<0.001, ****P<0.0001, n.s.: no significant difference, one-way ANOVA. PC: phosphatidylcholine; SM: sphingomyelin; So: sphingosine; HC: healthy controls; VS: vegetative state; MCS: minimally conscious state.
