the absence of s100 , gfa and gs from the ependymocytes of the sco , which are considered to be modified ependymal cells , suggests either a non-astrocytic lineage of these cells or an extreme specialization of the sco-cells as glycoprotein-synthesizing and secreting elements , a process that may have led to the disappearance of the glial markers .
C0007634
cells
C1327616
secreting