In the early 1990s, posters began to appear in GP surgeries, libraries and pharmacies across Bristol asking pregnant women to volunteer for a new study. More than 14,500 answered the call. Thirty years later, the Children of the 90s study is the most detailed project of its kind anywhere in the world. Crucially, the huge amount of genetic data it possesses has also come to the fore as the medical world tries to understand, and combat, Covid-19.

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