Time course of basal (--) and K⁺-evoked (--) glutamate release from cerebral cortical slices in normoxia and basal (-∆-) and K⁺-stimulated (-▴-) glutamate release in ischemia in 7-day-old (a) and 3-month-old (b) mice. The results are means of 4–8 independent experiments with SEMs indicated. Ischemia significantly () enhanced the release in both age groups, but K⁺ stimulation was effective only in normoxia in both. Note the fivefold difference in the scale of the -axis in panels (a) and (b).