Researchers in Romania say they have successfully created a type of artificial blood that hasn't shown any negative side effects in mice.
The artificial blood is hemerythrin based, which is a protein extracted from sea worms.
Researchers say lab mice given the artificial blood didn't reject it and didn't develop high toxicity in their systems. They also say it has a much longer shelf life than human blood, leading to the possibility of "instant blood", a powder that can be mixed with sterile water in an emergency.
If specialists remain convinced that there's no evidence of toxicity, testing on humans could begin in a year or two.
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