Doctors in Brazil discover and confirm that a woman has blood with male chromosomes, a rare case of human chimerism.

Purpose: About 50% of spontaneous abortions are caused by fetal chromosome abnormalities. Identification of these abnormalities helps to estimate recurrence risks in future pregnancies. However, due ...

Photograph of a karyotype - the collection of chromosomes within each cell of an organism - from a male mouse engineered by Johns Hopkins Medicine researchers to model Down syndrome in a human. The ...