| http://www.w3.org/ns/prov#value | - Protein purification techniques include, for example, precipitation with ammonium sulphate, PEG, antibodies, and the like, or by heat denaturation, followed by centrifugation; chromatography steps such as ion exchange, gel filtration, reverse phase, hydroxylapatite and affinity chromatography; isoelectric focusing; gel electrophoresis; and combinations of such and other techniques.
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