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The most obvious way that a pair of blood-related parents might increase health risks for a child is through a recessive disorder, like cystic fibrosis or sickle cell disease.

This results in red blood cells becoming sickle in shape and stiff and sticky - rather than flexible smooth discs.

In a large hall Mr Syrankov addresses a small audience, flanked by his party's emblem, the hammer and sickle.

In recent years, for example, a hundred patients suffering from the hereditary disease sickle cell anaemia have been treated with CRISPR-Cas-based therapeutics -- without AZD7648.

In the 1960s in North Carolina, Adams and her family would take her sister Linda, who had sickle cell anemia, to the emergency room because they had no doctor and could not afford health insurance.