In the January 15 issue of Biological Psychiatry, Volume 61, Number 2, the units of measure for CSF levels of glutamate, glycine, and aspartate were omitted from Table 1, Figure 1, and Figure 2 in the article “Low Cerebrospinal Fluid Glutamate and Glycine in Refractory Affective Disorder” by Frye et al. (Biol Psychiatry 2007;61:162-166). In all cases the CSF levels were stated in micromoles (μM).

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