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A Gi-linked receptor is not involved in Aβ-stimulated intracellular signaling. THP-1 monocytes were preincubated with 200 ng/ml pertussis toxin (PTX) for 30 min at 37°C and stimulated with Aβ25–35 or 1 μm fMLP for 3 min. Western blots of cellular lysates were probed with the anti-phospho-Tyr antibody 4G10 (PY) or with the anti-phospho-ERK antibody (P-ERK). Blots were stripped and reprobed with the anti-ERK antibody (ERK).
