cytochemistry showed that heterogeneity may also be characteristic of senescence particularly with regard to hepatocyte glucose-6-phosphatase which was absent in some cells , low in many cells but high in some and gamma-glutamyl transferase which was normally lacking from hepatocytes but localised as large deposits of reaction product on the plasma membranes of occasional cells isolated from old donors .
C0007603
plasma membranes
C0007634
cells