Radioactive material refers to material that may emit ionizing radiation by spontaneous nuclear transformation
2.
Because selective period of chloroplast transformation was longer than that of the nuclear transformation , only the several weakly regenerated plants with spectinomynic resistantance were obtained
3.
Gene silencing , a common phenomenon in phb production through nuclear transformation , had n ' t been observed in the chloroplast transgenic plants analyzed by northern dot blot
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