Of interest for the study of PD, BioGPS reports STK39 mRNA levels to be greatest in brain regions compared to other tissue tested with the affymetrix expression microarray U133, whereas CERS6 mRNA levels are higher in dendritic cells and in the pineal gland and B3GALT1 is expressed ubiquitously[16]. Here, CERS6 is linked to Parkinson disease.