An endocytosis process that results in the uptake of liquid material by cells from their external environment by the 'ruffling' of the cell membrane to form heterogeneously sized intracellular vesicles called macropinosomes, which can be up to 5 micrometers in size. [PMID:14732047]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process