Assertion: purity | /r/UsedFor | refer to the degree
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Source sentences:
text: An assay refers to an investigative (analytic) procedure in laboratory medicine, pharmacology, environmental biology and molecular biology for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity (the analyte) while purity refers to the degree to which a substance is undiluted or unmixed with extraneous material, typically expressed as a percentage (%).