C6 NBD ceramide is a biologically active fluorescent analog of short chain, membrane-permeable ceramides.{2754} It is as effective as C6 ceramide in the inhibition of viral glycoprotein transport through the Golgi.{2754} C6 NBD ceramide has been used as a fluorescent substrate for the activity of UDP-glucose:ceramide glucosyltransferase{2814} and to demonstrate the translocation of glucocerebroside and sphingomyelin from the Golgi to the plasma membrane.{3460}