When Heráclito Everson Biscaia Filho, a Brazilian expat living in Shenzhen, first donated blood at 18 in his home country, he had no idea that his blood type was rare. It wasn’t until years later, at a blood donation center in Shenzhen, that staff told him he has Rh-negative blood — known locally as “panda blood” — a type so scarce it appears in just 0.3% of the Han Chinese population. That discovery culminated yesterday in a remarkable act of dedication: his 100th blood donation in Shenzhen

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