FIGURE 11 Top: reaction product is present in the rough ER cisternae of this experimental section from a
liver fixed with 1% formaldehyde (arrows). The circled structure seems to be a highly reacted particle within
the smooth-surfaced end of a rough ER cisterna. The double arrow points to a vesicle which is so full of
reaction product that it is impossible to determine whether it contains a particle. No lead stain, x 30,000.
Bottom: another area from the same section. Reaction product completely fills the blind end of one cisterna
(circle) while the vesicle beneath it seems to contain a highly reacted particle (arrow). The arrowhead
indicates what appears to be a reacted particle within the smooth end of a rough ER cisternae. The four
cisternae converging at the upper right bear reaction product on their ribosomes and membranes. The
ribosomal reaction is particularly striking in the region within the rectangle. No lead stain, x 38,400.