The researchers found that the genome of the same species are different. Which can check the difference by using restriction endonuclease and bring the pieces. "DNA to แยกขนาด by way of gel electrolytes fo RI sis. And check methodSo the form of strips. "DNA that appears after the restriction endonuclease could link up Ji Nome. Organisms that Boeing called difference of form of a bar. "DNA caused by the cutting of the enzyme cutting spring that these residence electric.Village, polymorphism (restriction fragment length polymorphism:RELP.) ", which can be used to mark a thousand industry (genetic marker)