The first notable result obtained in this study was that two well-delineated mesencephalic structures, the SNpc and the PAGsm, share the same enzymatic pathways involved in DA synthesis and release, while the second important result was the significant decrease in TH and DAT immunoreactivity observed in these specific neuronal centers in 78% of SIDS victims, all died during their sleep. Here, SLC6A3 is linked to sudden infant death syndrome.