When Bangalore-based Aditya Hegde received a call, informing him of a pregnant woman who desperately needed a blood transfusion in Chennai, he did not think twice. Grabbing the first train he could find to Chennai, he rushed to the aid of the woman, donated one unit of blood, and saved not only her life but that of her child.

The 34-year-old financial professional is not just any donor. He has a rare blood type, known as HH negative, or the Bombay blood group, which was only recently discovered and is said to be found in just one of 10,000 people in India, and one in 1,000,000 people in Europe.

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