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pharmacodynamic pharmacokinetic pharmacogenetics drug pharmacogenomics recombinase gene repressor gene sterile seeds gurts trait based technologies terminator technology nonsynonymous mutation synonymous mutation phylogenetic trees the聽molecular clock types of topoisomerases topoisomerases linking number dna supercoiling pathogen triggered immunity effector triggered immunity phytoalexins pamps why it is an alternative source its advantages types of biofuel types and uses of organic forming brinjal and corn bt crops like cotton