ACh (acetylcholine), PE (phenyl ephedrine), DMSO (dimethyl sulfoxide), and DPPH (2,2-diphenyl-1-picrylhydrazyl) were acquired from Sigma–Aldrich (Dorset, UK); DAF-FM (4-amino-5-methylamino-2’,7’-difluorofluorescein di-acetate) was acquired from Molecular Probes (New York, NY, USA). Deionized-Ultrapure H2O was utilized as solvent except for DPPH and natural metabolites, where DMSO (conc. not exceeding 0.1%) was utilized.
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