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New York-based fertility doctor Dr Brian Levine wasn’t fazed when one client, a successful woman in her 40s, requested a novel approach to her IVF procedure. She asked him to find her sperm from three different donors and fertilise eggs in three standalone procedures. “Whoever made the best embryos, she’d use the cohort from them,” Dr Levine explains of her rationale. “People are so obsessed with the quality of sperm that they’ll buy vials from multiple donors to figure out…
