The enzyme 5-enolpyruvyl-shikimate-3-phosphate synthase, which is naturally produced by an Agrobacterium species (strain CP4) of soil bacteria. CP4 EPSPS is essential for the functioning of that bacterium’s metabolism biochemical pathway. CP4 EPSPS happens to be unaffected by glyphosate containing herbicides, so introduction of the CP4 EPSPS gene into crop plants (e.g., soybeans) makes those plants essentially impervious to glyphosate-containing herbicides.