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Western blotting of protein kinase B (PKB, also known as Akt) and its phosphorylated (active) form (p-Akt) in U87MG cells treated for 48 h with different concentrations (100, 250, and 500 µg/mL) of Crataegus berry (a), leaf (b), and flower (c) extracts. Non-treated cells served as a control. GAPDH was used as a protein loading control.
