A prenatal test in which a sample of tissue from the chorion is taken to test for genetic conditions or birth defects.

A hormone produced by the placenta during pregnancy that helps maintain the corpus luteum and stimulates the production of progesterone.

A prenatal test where a sample of chorionic villi is taken to detect genetic disorders early in pregnancy.

The layer of blood vessels in the eye that supplies nutrients to the retina and the outer layers of the eye.

One of two identical halves of a chromosome formed after DNA replication, which will separate during cell division.

A complex of DNA and proteins found in the nucleus of eukaryotic cells, which condenses to form chromosomes during cell division.

The thread-like structures of chromatin that exist during interphase and are composed of DNA wrapped around histone proteins.

A laboratory technique used to separate mixtures of substances based on differences in their physical or chemical properties.

A pigment-containing cell found in some organisms like cephalopods, which allows them to change color for camouflage or communication.

The region of the cell nucleus where heterochromatin is concentrated, usually near the center of the nucleus.