Is cloning necessary?
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D000820:Animal Diseases / Q000191:economics / Q000235:genetics / Q000517:prevention & control; D000822:Animal Husbandry / Q000191:economics / Q000639:trends*; D000818:Animals; D019976:Cloning, Organism / Q000191:economics / Q000706:statistics & numerical data / Q000662:veterinary*; D003362:Cost-Benefit Analysis; D005818:Genetic Engineering / Q000191:economics / Q000639:trends*; D007113:Immunity, Innate / Q000235:genetics