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flag Scientists created lab-grown blood-producing structures from human stem cells that mimic early embryonic development.

flag Scientists have created lab-grown embryo-like structures called hematoids from human stem cells that produce blood cells within two weeks, mimicking early human development. flag These structures form the three primary tissue layers by day two and show visible red blood cell clusters by day 13, replicating stages equivalent to weeks four to five of embryonic development—typically inaccessible for study. flag Unlike real embryos, hematoids lack a yolk sac and placenta, preventing further growth. flag The model enables research into blood and immune system formation, disease modeling, drug testing, and regenerative medicine, including potential therapies using a patient’s own cells. flag The findings, published in Cell Reports and led by the University of Cambridge’s Gurdon Institute with support from Wellcome, are patented through Cambridge Enterprise.

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