I was unsuccessful to find anything in the literature about proteins that are not reabsorbed (efficiently) in the renal tubule. Maybe it was the way I searched or it doesn't occur or no one has looked for it. Sure, it's unlikely and I assume the uptake mechanisms are so "generic" that any protein/peptide will be fished out of the filtrate and taken up by tubular cells. But maybe there are some proteins that escape this?
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