A process for isolating one or more RNA molecules associated with {HEAD ~ target gene} silencing from {TAIL ~ a sample} of material from a plant, wherein the RNA molecules are SRMs which share sequence identity with the target gene, and wherein said silencing is initiated by introduction of an exogenous nucleic acid, which process comprises the steps of: 
silencing from
A process for isolating one or more RNA molecules associated with { HEAD ~ target gene } silencing from { TAIL ~ a sample } of material from a plant , wherein the RNA molecules are SRMs which share sequence identity with the target gene , and wherein said silencing is initiated by introduction of an exogenous nucleic acid , which process comprises the steps of :
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