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Effect of 20 min pretreatment with 2 mM cAMP on 1 nM VEGF-induced vessel hyperpermeability to IgG in rat cerebral microvessels. P (mean ± SE) was plotted as a function of time. The solid line with the ■ is for the test group and the dashed line with ○ is for the control group. * p < 0.05 compared with the baseline.
