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Season 6 of HBO’s vampire drama True Blood premieres on Sunday night, presumably following up on last year’s cliffhanger where the factory that produces Tru-Blood — the bottled synthetic blood that allows vampires go “vegetarian” — was burned to the ground, destroying the product that made it possible for vampires to non-violently co-exist with people.

But out here in the real world, the future of synthetic blood is just beginning. After decades of global research, controversies, and failed approval petitions, the UK’s Medical and Healthcare products Regulatory Agency finally gave researchers at the Scottish Centre for Regenerative Medicine the go-ahead late last month to start developing synthetic blood with adult stem cells.

The license allows the researchers to use already-recognized stem cell technology to create a compound that would both eliminate the risk of infusion-transmitted infections and supplement (if not eventually take the place of) chronically limited blood banks worldwide. After years of partial synthetic successes at best, it will permit the first-ever human clinical trials of synthetic blood. Oh, also? The license permits blood manufacturing “on an industrial scale.”...