*2.1. Materials*

L-dopa and acetylcholinesterase activity assay kit (Cat# CS0003) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Folin–Ciocalteu phenol reagent and aluminum chloride were obtained from Loba Chemie (Mumbai, India). Quercetin (98% purity) was purchased from Chanjao Longevity Co., Ltd. (Bangkok, Thailand). P19 cell line ATCC CRL-1857 was obtained from American Type Culture Collection, USA. Alpha minimal essential

medium (α-MEM), fetal bovine serum (FBS), newborn calf serum (NCS), and antibioticsantimycotic solution were purchased from Gibco, USA. All *trans*-retinoic acid, cytosine-1-β-D-arabinoside, 1:250 porcine trypsin, poly-L-lysine (MW > 300,000), XTT (2,3-bis(2 methoxy-4-nitro-5-sulphonyl)-2H-tetrazolium-5-carboxanilide sodium), and phenazine methosulfate (PMS) were obtained from Sigma, USA. Dimethylsulfoxide (DMSO) and methanol analytical grade were purchased from Merck, Germany. A total of 96-well plates were purchased from Corning, USA. A 100-mm Bacteriological culture dish was obtained from Hycon, USA.
