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•  blood group incompatibility (Condition in which cells of a fetus are attacked in utero by the immune system of its mother. ...)
•  chorionic gonadotropin (Protein hormone secreted by the blastocyst and placenta that affects sexual development while in ...)
•  embryology (Study of prenatal development from conception through the eighth week in utero. Sometimes used ...)
•  embryonic stage (Interval during human gestation following the preembryonic stage that extends from the second to ...)
•  ex utero (Out of the uterus; used principally with reference to testing blastocysts for genetic defects ...)