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Example 13C MRS spectra for sperm incubated with: (a) 13Cu-glucose; (b) 13Cu-fructose; or (c) 13C1-pyruvate. Integral locations and widths are highlighted in red. Key: Sub – peaks from respective incubated substrate; L1, L2, L3 – lactate peaks, where the number indicates the carbon position, B – bicarbonate, C – carbon dioxide, U – urea.
