María Ángeles Muñoz has gone from watching children die with AIDS to building miniature brains with stem cells. This is how it works in the Spanish network of biobanks

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In 1992 María Ángeles Muñoz was in the middle of the perfect storm. A little-known virus was wreaking havoc in Madrid and other Spanish cities. Deaths increased every year without doctors being able to do much to prevent it. In 1995, almost 6,000 people died throughout the country. This doctor and biologist from Madrid remembers seeing young children die who had been infected by their mothers during pregnancy. They were the worst years of the global AIDS epidemic.

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