STX1B and Parkinson disease: Moreover, in addition to αSyn, encoded by SNCA (synuclein alpha), three other proteins (contactin-associated protein 1, encoded by CNTNAP1, tyrosine-protein kinase Fyn, encoded by FYN; [FYN proto-oncogene, Src family tyrosine kinase] and syntaxin 1B, encoded by STX1B, were also present in the list of genes associated with PD from the GWAS meta-analyses (Figure 4C).