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A,B Comparison of the average MTRasym spectra of the tumor mass and CNAWM for GBMs with an unmethylated MGMT promoter (n = 8, A) and a methylated MGMT promoter (n = 10, B). The CEST effects were clearly observed at multiple frequencies in the 1–4.5 ppm frequency offset range. C The average relative MTRasym spectra of the tumor mass (MTRasym spectra from tumor mass - MTRasym spectra from CNAWM). The error bars in the figures are shown as standard errors.
