The invention relates to the use of DNA sequences from bacteria and parasites, namely the genes gcpE and yfgB for integration in the genome of viruses, eukaryotes, and prokaryotes and thereby altering the concentration of isoprenoid. The invention also relates to methods for identifying substances that exhibit a herbicidal, antiparasitic, antiviral, and fungicidal activity in plants and an antimycotic, antiparasitic and antiviral activity in humans and animals.
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