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1. The high-resolution 1H NMR (MRS) spectra of human brain tumor homogenates revealed a broad resonance at 5.3–5.4 ppm in glioblastoma multiforme (N = 16) and brain metastases (N = 2). The broad resonance was identified as ceramide, a sphingosine–fatty acid combination portion of ganglioside, indicating an elevated abundance of monounsaturated fatty acids. GLC analysis of gangliosides in the highly...
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