Formation of apical tubules from large endocytic vacuoles in kidney proximal tubule cells during absorption of horseradish peroxidase

Using horseradish peroxidase (HRP) as a tracer, we have investigated if the so-called apical tubules (AT) in the kidney proximal tubule cells are directly involved in the endocytic process by carrying the tracer into the cells, or if they are derived from the intracellular membrane compartments. Rat...

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