Two-year-old Zainab Mughal, from Tallahassee, in Florida, was recently diagnosed with high-risk neuroblastoma. What makes Zainab’s blood different is that it is missing a common antigen, called ‘Indian B’, which most people carry in their blood cells. The only people likely to be a match for Zainab are those whose blood type is ‘O’ or ‘A’ – and whose parents are both 100 per cent Pakistani, Indian or Iranian.

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