| http://www.w3.org/ns/prov#value | - Vectors derived from viruses, such as retroviruses, adenoviruses, and the like, may be employed. [0118] The term "small interfering RNAs"or "siRNAs"refers to nucleic acids around 19-30 nucleotides in length, and more preferably 21-23 nucleotides in length.
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