A previous metabolomics study reported that there was an increased level of taurine in 6-hydroxydopamine (6-OHDA)-induced PD rats, while the high expression of taurine was significantly reduced after basic fibroblast growth factor (bFGF) administration on PD [49], which has been considered a potential candidate for PD treatment by promoting the survival of dopamine neurons [50,51]. The gene discussed is FGF2; the disease is Parkinson disease.