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Number of men approached, consented and semen sample used for the study. GLC, 13Cu-glucose; FRC, 13Cu-fructose; PYR, 13C1-pyruvate. aEjaculates used for method development and washed with 40% Percoll/PBS only (Calvert et al. 2019); b11 ejaculates were used for both 1H and 13C MRS experiments; c1 sample randomly removed from analysis in order to balance groups.
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