Defense Against Plant Pathogens Gene Silencing in Fungal Organisms RNA Interference in the Nematode C Elegans RNA Silencing in Drosophila RNA Silencing in Protozoa Examples of RNA Silencing in Lower Metazoa Gene Silencing in Non-Mammalian Vertebrates RNA Silencing in Mammals I RNA Silencing in Mammals II RNA Silencing in Angiosperm Plants I RNA Silencing in Angiosperm Plants II.