
Keywords: MS; mass spectrometry; GC; gas chromatography; LC; liquid chromatography; BBB; blood brain barrier; CYP; cytochrome P450; 24S-HC; 24S-hydroxycholesterol; 26-HC; (25R)26-hydroxycholesterol; 7αH,3O-CA; 7α-hydroxy-3-oxocholest-4-enoic acid; 3β,5α-diHC-6O