Analysis of sphingomyelin levels in MSA and control white matter. (A) Bubble plots illustrating the mass/charge ratio (m/z), column elution time, and relative abundance (size of the bubbles) of sphingomyelin species detected in the MC white matter. (B,C) Bar graphs showing the absolute amounts of different sphingomyelin species in the MSA-affected (MC) and unaffected (VC) white matter. (D) A comparison of the total sphingomyelin levels. (E) The relative sphingomyelin levels in VC and MC. Data represent mean and SE as error bars, *p < 0.05.