| http://www.w3.org/ns/prov#value | - Exemplary detectable labels include radioactive labels (e.g., isotopes such as 32P or 35S) and nonradioactive labels (e.g., chemiluminescent labels or fluorescent labels, e.g., fluorescein). [0018] In preferred embodiments for the above methods of measuring the level of an activity or protein of interest, the solid support is contacted with multiple reference samples, each with a different level o
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