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Diurnal changes in plasma glucose levels (mg/dL; mean ± 1 SD; n = 6 per group) in the arterial blood of rats in groups 1 through 4 (closed circles), 5 (triangles), and 6 (constant bright light; open circles). Rats were exposed to dark-phase lighting cycles (as described in the legend to Figure 1) from 1800 to 0600 (dark bars). Data are plotted twice. Concentrations without asterisks are different (P < 0.05) from concentrations with asterisks.
