A 2003 study concluded the RR gene had been bred into so many different soybean cultivars, there had been little decline in genetic diversity, but "diversity was limited among elite lines from some companies".
Un estudo de 2003 conclúe que os xenes RR que foron engadidos a diferentes tipos de cultivares de soia amosaron unha pequena diminución da diversidade xenética, pero "a diversidade limitouse entre as liñas élite dalgunhas empresas.