The DLG2 encoded protein has been shown to interact with the glutamate receptors,31 it has been shown to be involved in the Fyn‐dependent tyrosine phosphorylation of NR2 subunits of N‐methyl‐D‐aspartate glutamate receptors,32 and the excitotoxicity mediated by these receptors has been reported to be involved in the pathogenesis of PD.33 Here, FYN is linked to Parkinson disease.