Science / Biology / Embryo: Term applied to the zygote after the beginning of mitosis that produces a multicellular structure.

Embryonic Stem (ES) Cells

Science / Genetics / Embryonic Stem (ES) Cells: An embryonic cell that can replicate indefinitely, transform into other types of cells, and serve as a continuous source of new cells. MORE

Embryo Sac

Science / Biology / Embryo Sac: Alternate term applied to the angiosperm female gametophyte contained within a megaspore. MORE

Chorionic Villus Sampling

Science / Genetics / Chorionic Villus Sampling: An invasive prenatal diagnostic procedure involving removal of villi from the human chorion to obtain chromosomes and cell products for diagnosis of disorders in the human embryo. MORE


Business / Agriculture / Teratogen: A chemical that causes nonhereditary birth defects in a developing fetus. Teratogencity is taken into account in assessing the toxicity of pesticides and other chemicals. Both level and timing of expo MORE

Aggregation Technique

Science / Genetics / Aggregation Technique: A technique used in model organism studies in which embryos at the 8-cell stage of development are pushed together to yield a single embryo (used as an alternative to microinjection). MORE


Science / Biology / Villi: Finger-like projections of the lining of the small intestine that increase the surface area available for absorption. Also, projections of the chorion that extend into cavities filled with maternal bl MORE