“Look, we’re not fools. We understand these are prehistoric animals. They are part of a vanished ecology—a complex web of life that became extinct millions of years ago. They might have no predators in the contemporary world, no checks on their growth. We don’t want them to survive in the wild. So I’ve made them lysine dependent. I inserted a gene that makes a single faulty enzyme in protein metabolism. As a result, the animals cannot manufacture the amino acid lysine. They must ingest it from the outside. Unless they get a rich dietary source of exogenous lysine—supplied by us, in tablet
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