negative regulation of cellular amide metabolic process negative regulation of sphingolipid biosynthetic process negative regulation of ceramide biosynthetic process 2012-01-25T03:18:07Z Any process that stops, prevents or reduces the frequency, rate or extent of a ceramide biosynthetic process. GO:1900060 biological_process down regulation of ceramide anabolism down regulation of ceramide biosynthesis down regulation of ceramide biosynthetic process down regulation of ceramide formation down regulation of ceramide synthesis down-regulation of ceramide anabolism down-regulation of ceramide biosynthesis down-regulation of ceramide biosynthetic process down-regulation of ceramide formation down-regulation of ceramide synthesis downregulation of ceramide anabolism downregulation of ceramide biosynthesis downregulation of ceramide biosynthetic process downregulation of ceramide formation downregulation of ceramide synthesis dph inhibition of ceramide anabolism inhibition of ceramide biosynthesis inhibition of ceramide biosynthetic process inhibition of ceramide formation inhibition of ceramide synthesis negative regulation of ceramide anabolism negative regulation of ceramide biosynthesis negative regulation of ceramide formation negative regulation of ceramide synthesis regulation of ceramide biosynthetic process