• Thank you for visiting nature.com. • You are using a browser version with limited support for CSS. • To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). • In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. • The age of animal experiments is waning. • Where will science go next?

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  • Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The age of animal experiments is waning. Where will science go next? Advances in organ and computer models are raising the prospect that some animal experiments could be eliminated. But there are still huge hurdles to overcome. Last November, the UK government annou

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