Modeling embryonic circulation, researchers produce elusive precursor blood stem cells

Blood stem cell donors are in chronic short supply, posing problems for patients whose blood stem cells have been depleted by chemotherapy or who have diseases like aplastic anemia. Donor cells used in transplantation must be tissue-matched to patients, so those who come from minority ethnic backgrounds often struggle to find a compatible donor. And even when donor cells are successfully engrafted, there is no guarantee that the patient’s body won’t reject them.

Newborns get routine heel blood tests, but should states keep those samples?

Close to 4 million babies are born in the U.S. every year, and within their first 48 hours nearly all are pricked in the heel so their blood can be tested for dozens of life-threatening genetic and metabolic problems. The heel-stick test is considered such a crucial public health measure that states typically require it, and parents aren’t asked for their permission before it’s done.

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