| http://www.w3.org/ns/prov#value | - eferably less than 50 nm, and more preferably less than 30 nm. [0067] The term ???detectable substance??? refers to a molecule or other entity or group, the presence, or absence, or quantity of which in a material such as a biological material, is to be ascertained by use of, for example, an assay as described herein. [0068] The term ???affinity molecule??? refers to a molecule or group of molecul
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