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A drug or compound that induces the expulsion of an embryo or fetus .
The expulsion or removal of an embryo or fetus from the mother prematurely; this can be done as an artificial procedure, but it often happens naturally when the mother's body expels the embryo/fetus because it has died, has genetic or developmental defects, or because of infection or illness in the mother. Natural abortions are typically called "miscarriages". Medically-induced abortions, which can be completed with surgery or with hormone drugs, are done because the embryo/fetus is unwanted, deformed, not likely to live, or endangers the mother's life or health.
In botany terminology, describes the orientation of an embryo , with the radicle lying against the edges of the two cotyledon s.
4. Alpha fetoprotein (AFP)
This is a protein the blood level of which is measured by laboratory methods. Its level is elevated in the mother's blood when there are fetal spinal cord defects (anencephaly, myelomeningocele), threatened abortion, twin gestation, and abruptio placentae. The AFP screening test for the mother's blood is usually conducted at 16 - 18 weeks of pregnancy. AFP level in the amniotic fluid obtained in amniocentesis is measured to identify abnormal fetal development. In humans, AFP is a useful marker for the diagnosis and assessment of the tumors of the testis (teratocarcinoma and embryonal carcinoma). AFP is also elevated in patients with primary liver cancer (hepatocellular carcinoma) and in women with some types of germ cell ovarian tumors. (Normal range: less than 40 micrograms per liter).
A cell found floating freely in the amnion sac (a membranous sac containing the amniotic fluid) surrounding an embryo .
6. Amniote egg
An egg with compartmentalized sacs (a liquid-filled sac in which the embryo develops, a food sac, and a waste sac) that allowed vertebrates to reproduce on land.
7. Analogous structures
Body parts that serve the same function in different organisms, but differ in structure and embryological development; e. g., the wings of insects and birds.
* A cell in the embryo which develops into blood vessel tissue. * An embryonic mesenchymal tissue which differentiates into the blood cells and blood vessels.
The formation of new blood vessels. This occurs normally during the development of the embryo , but can also occur abnormally around malignant tumor s.
10. Anther culture
A plant culturing technique in which immature pollen is made to divide and grow into tissue (either callus or embryonic tissue) in either a liquid medium or on solid media. Pollen-containing anther s are removed from a flower and put in a culture medium; some microspheres survive and develop into tissue. If embryonic tissue develops, it's put in a medium favorable for shoot and root development; if it's callus tissue, it's put in a solution of hormones that will spur it to differentiate and develop shoot and root tissue.