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Well you're looking at two dissimilar cases here. The mice are a GM breed, with the pat/matriarch transfected whilst still at the egg stage.
Genetically modifying an adult to this extent is currently well beyond our abilities. Even attempts to modify a cell culture typically result in only partial transfection, the majority of which is usually transient. To maintain a stable transfection in vivo antibiotics are used to select out the cells without the relevant plasmid. To attempt widespread transfection within a human adult would be very tricky indeed, with no guarantees as to what proportion of the cells will take up the transfectant, nor how long it would last (so to answer your second question, probably not - the gene therapy would wear off like most drugs).
As for creating soldiers whilst they are still just eggs, well it's possible but you've got an 18 year wait to see if it pays off with every chance that something better or cheaper will present itself in the meantime. Ethical issues aside, I don't think it's a good investment. If measures to introduce longer lasting transfection within adults are developed then that might change, obvs. |
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