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When asked by the BBC about the formulation of the deal and whether mistakes had been made, an NHS spokesperson said there were "several factors which influence a procurement strategy and construct of the contract", without elaborating further.
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Madeleine Finlay sits down with science editor Ian Sample and science correspondent Nicola Davis to discuss three eye-catching stories, including the impact of a powerful psychedelic on depression, answers on the death of Russian opposition leader Alexei Navalny, and an explanation to the mystery of why humans have chins