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Zhuang & Liu ( 2006 ) emended the generic concept of Geopyxis to accommodate species with ornamented and guttulate ascospores and presented morphological and nuSSU rDNA sequence data to support their emendation . Likewise , despite the similar potential for unintended effects , FDA believes that declining to propose a requirement that the agency be notified about the commercialization of food source plants transformed using techniques other than rDNA is consistent with its current conclusion that , unexpected effects aside , rDNA techniques have a greater potential , relative to conventional methods of breeding , to result in the development of foods that present legal status questions . A combined data set of mt SSU and nu LSU rDNA data was used by Staiger et al. ( 2006 ) to evaluate the revised generic concept in the family proposed by Staiger ( 2002 ) . The sequence for the ssu rDNA gene is still the best place to start studying a new organism , and is very useful for figuring out specific relationships , as will be discussed later . There is substantial basis to conclude , however , that there is greater potential for breeders , using rDNA technology , to develop and commercialize foods that are more likely to present legal status issues and thus require greater FDA scrutiny than those developed using traditional or other breeding techniques .