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Effect of dibutyryl cAMP on EGF receptor activity. Lacrimal gland acini were incubated with EGF (10−7 M) or dbcAMP (10−3 M) for 5 minutes. Western blot analysis was performed using an antibody against phosphorylated EGF receptor. Data are mean ± SEM from five independent experiments (A). *Significant difference from basal. Representative blot (B).
