RT Journal Article SR Electronic T1 Transplacental passage of blood cells. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 230 OP 242 DO 10.1136/jmg.12.3.230 VO 12 IS 3 A1 Schröder, J YR 1975 UL http://jmg.bmj.com/content/12/3/230.abstract AB