because cmp-sialic acid is believed to be the sole sialosyl donor in the cells , its migration in axons toward terminals , together with the previous demonstration of sialyltransferase activity in the synaptosomal plasma membrane , strongly supports the possibility that sialosylation of gangliosides and probably of other sialoglycoproteins is not confined to the golgi apparatus , but can also occur after the compounds are committed to axonal transport .
C0007634
the
C0007603
plasma membrane