She asked me to do a KB test to check for fetal cells in the maternal circulation. (skepticalob.com)
Transfer of levonorgestrel (LNG) administered through different drug delivery systems from the maternal circulation into the newborn infant's circulation via breast milk. (pediatrics.aappublications.org)
Putting these two sets of observations together, Vijayakrishna Gadi and Lee Nelson hypothesized that the persistence of fetal cells in the maternal circulation might protect mothers from breast cancer in a manner similar to the protection afforded by a bone marrow transplant. (discovermagazine.com)