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Schoenenberger and Monnier reported in the Proceedings of the National Academy of Sciences USA the isolation, sequence determination and synthesis of the active material, identified as the nonapeptide Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu, and demonstrated that intraventricular infusion of the synthetic compound in rabbits reproduced delta- and spindle-EEG enhancement under double-blind conditions (Schoenenberger & Monnier, 1977)

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In vitro study using human vascular endothelial cells further confirmed the increased mRNA and protein expressions of VEGFR2 but not VEGF-A by BPC 157