Therefore, we selected concentrations below 30 μM, namely 2.5, 5, and 10 μM, to further investigate the neuroprotective activity of epicoccin A. To investigate the inhibitory effect of epicoccin A on the loss of DA neurons in PD, we evaluated the length change in DA neurons using transgenic zebrafish slc18a2:GFP. Here, SLC18A2 is linked to Parkinson disease.