Background: Small interfering RNA (siRNA), sometimes known as short interfering RNA or silencing RNA, are a class
of 20-25 nucleotide-long double-stranded RNA molecules that play a variety of roles in biology. Most notably, siRNA is involved in
the RNA interference (RNAi) pathway where the siRNA interferes with the expression of a specific gene. In addition to their role in
the RNAi pathway, siRNAs also act in RNAi-related pathways, e.g. as an antiviral mechanism or in shaping the chromatin structure of
a genome; the complexity of these pathways is only now being elucidated.
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Ch 8.Immunohistoch / immunology
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