sialooligosaccharide chains of chromogranin a and , possibly , chromogranins ' phosphoserine/phosphothreonine groups , seem to interact with guanidyl , amino , and/or imidazole groups of non-chromogranin components to form silver complexing sites accounting for granules ' argyrophilia , which can be removed or blocked without affecting chromogranin immunoreactivities .
C0055633
chromogranin a
C0008586
chromogranin