[biological_process] fatty acid elongation, monounsaturated fatty acid <sep> fatty acid elongation, polyunsaturated fatty acid <sep> fatty acid elongation, saturated fatty acid <sep> long-chain fatty acid biosynthetic process <sep> long-chain fatty-acyl-CoA biosynthetic process <sep> sphingolipid biosynthetic process <sep> unsaturated fatty acid biosynthetic process <sep> very long-chain fatty acid biosynthetic process