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The woman received a “haplo/cord transplant” that included a mixture of stem cells from a relative and stem cells from an infant’s umbilical cord.

The half-matched “haplo” cells from her relative propped up her immune system until the cord blood cells became dominant, making the transplant much less dangerous, said Dr. Marshall Glesby, an infectious diseases expert at Weill Cornell Medicine of New York and part of the research team.

Haplo-, in Greek compounds, single; as Haplostemonous, having only one series of stamens.