A renal system process in which proteins are taken up from the collecting ducts, glomerulus and proximal and distal loops of the nephron. In non-mammalian species, absorption may occur in related structures (e.g. protein absorption is observed in nephrocytes in Drosophila, see PMID:23264686). [GOC:yaf, PMID:18431508]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process