| http://www.w3.org/ns/prov#value | - Detectable labels are well known in the art and include, without limitation, radioactive labels (e.g., isotopes such as 32P or 35S) and nonradioactive labels (e.g., chemiluminescent labels or fluorescent labels, e.g., fluorescein). [0017] In a related aspect, the invention provides a method for measuring the level of an endogenous protein in a cell, nucleus, chromatin mass, cell lysate, or in vitr
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