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Removing low molecular weight contaminants explained the behaviour of one preparation and not the others, so purity is one cause of the variation rather than the whole of it.\nexposure: Five laminarin preparations of molecular mass 4400 to 34,400 daltons, before and after extensive dialysis\nevidence_span: {\"source_cache\": \"artifacts/glucan-research/29246954.abstract.txt\", \"locator\": \"Indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"5afc1ddc8e49971759dcdc432cedb4c22cad267cace1e3909dd577c8ebb9eaa6\", \"start_char\": 0, \"end_char\": 1760, \"text_sha256\": \"5afc1ddc8e49971759dcdc432cedb4c22cad267cace1e3909dd577c8ebb9eaa6\"}\n[bg-p29246954] Immunoregulatory Activity of the Natural Product Laminarin Varies Widely as a Result of Its Physical Properties. 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