| http://www.w3.org/ns/prov#value | - For example, one type of sandwich assay is an ELISA assay, in which case the detectable moiety is an enzyme. [0170] For immunohistochemistry, the tumor sample may be fresh or frozen or may be embedded in paraffin and fixed with a preservative such as formalin, for example. [0171] The antibodies may also be used for in vivo diagnostic assays.
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