Biotechnology has been practiced in agriculture for millennia, including through traditional selection for pest resistant crop varieties. Marker assisted selection, where molecular Genetic markers are used to accelerate the breeding process for key traits, is now widely used. Biotechnology is also being use to understand the basic genetic machinery of crops. The entire genome of the small weedy cabbage relative Arabidopsis has been sequenced, a major success which rivals the human genome project in scope and importance, and allows a much deeper understanding of plant function. Modern techniques in genetics and biochemistry have been applied to unravel everything from the effects of introduction practices on the genetic variability of insects and diseases brought from Europe for the biocontrol of weeds, to the characterisation of pesticide resistance mechanisms. The detection and diagnosis of pests and diseases has also been dramatically improved by molecular means, often through antibody systems, similar to home pregnancy test kits, and some can be used in the field. An example was the Lepton test kit to distinguish species of cotton bollworms (Helicoverpa armigera vs H. punctigera)