| http://www.w3.org/ns/prov#value | - Cais discloses that any metal element or combination of metal elements, including noble metals from group VIII such as Ru, would be suitable components of organometallic labels detectable by atomic absorption methods. (Cais, column 11, line 20) However, ruthenium is not a preferred metal in Cais, osmium is not specifically mentioned, no data is presented on the efficiency of using Ru or Os in any
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