Additionally, fetal cells are commonly found in the circulating blood of healthy women who have given birth. Fetal cells represent a naturally acquired source of allogeneic immune cells; in prior studies the prevalence of T, B, natural-killer (NK) and antigen-presenting cells of fetal origin in healthy women ranged from 30 percent to 70 percent, depending on the cell type.
The research was funded by the National Institutes of Health and Amgen Inc.