A process for isolating one or more RNA molecules associated with target gene silencing from {HEAD ~ a sample} of material from a plant, wherein the RNA molecules are {TAIL ~ 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: 
A process for isolating one or more RNA molecules associated with target gene silencing from { HEAD ~ a sample } of material from a plant , wherein the RNA molecules are { TAIL ~ 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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