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Mean MR spectra of different breast cancer subtypes. MR spectra of a) basal-like (N = 19), b) luminal-B (N = 6), c) ER negative (N = 27) and d) ER positive (N = 6) xenograft samples, and of e) ER negative (N = 13), and f) ER positive (N = 37) breast cancer tissue samples from patients. Abbreviations: Lac: lactate, PE: phosphoethanolamine, Cre: creatine, Gln: glutamine, Glu: glutamate, Gly: glycine, Tau: taurine, GPC: glycerophosphocholine, PCho: phosphocholine, Cho: choline.
