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Concentration of the gfp gene in roots of transgenic and nontransgenic maize, as determined by quantitative PCR analysis. X090 and 33–7 maize seeds soaked in a B916‐gfp suspension were grown under greenhouse conditions; 150 mg of tissue from each seedling were collected at 5 days (n = 5), and total genomic DNA was extracted for quantitative PCR analysis
