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FIG 6. Comparison of Cho/Cr and MI/Cr in vivo and ex vivo in the frontal cortex after SIV infection. Time course of Cho/Cr in vivo differs from Cho/Cr ex vivo. One possible explanation is that significant changes in the macromolecular contributions to the in vivo MR spectrum occur during infection and that extraction procedure removes these. Differences between in vivo and ex vivo MI/Cr are also apparent although not as dramatic. In vivo data were previously reported (1). Error bars = SEM.
