Abstract
We have used serial sectioning to study the topology of Golgi cisternae in insulin-secreting cells during secretion-stimulated endocytotic uptake of exogenous horseradish peroxidase (HRP). HRP-labelled cisternae were followed on several series of consecutive sections. This revealed that labelled cisternae could always be traced to a position in the Golgi stack intermediate between the cis and the trans poles. This occurred in spite of the apparent cis or trans locations of HRP-containing cisternae on some sections. The latter images could be explained by the lack of the true cis or trans (clathrin-coated) cisternae at certain levels of the stack.
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